diff --git a/tailbone/grids/core.py b/tailbone/grids/core.py
index 639eabd1..6373add6 100644
--- a/tailbone/grids/core.py
+++ b/tailbone/grids/core.py
@@ -32,7 +32,7 @@ import sqlalchemy as sa
 from sqlalchemy import orm
 
 from rattail.db.types import GPCType
-from rattail.util import prettify, pretty_boolean, pretty_quantity, pretty_hours
+from rattail.util import prettify, pretty_boolean, pretty_quantity
 from rattail.time import localtime
 
 import webhelpers2_grid
@@ -541,7 +541,8 @@ class Grid(object):
         value = self.obtain_value(obj, field)
         if value is None:
             return ""
-        return pretty_hours(hours=value)
+        app = self.request.rattail_config.get_app()
+        return app.render_duration(hours=value)
 
     def set_url(self, url):
         self.url = url
diff --git a/tailbone/views/shifts/core.py b/tailbone/views/shifts/core.py
index b6d9aadf..8fa934ea 100644
--- a/tailbone/views/shifts/core.py
+++ b/tailbone/views/shifts/core.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2022 Lance Edgar
+#  Copyright © 2010-2023 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,31 +24,32 @@
 Views for employee shifts
 """
 
-from __future__ import unicode_literals, absolute_import
-
 import datetime
 
-import six
-
 from rattail.db import model
 from rattail.time import localtime
-from rattail.util import pretty_hours, hours_as_decimal
+from rattail.util import hours_as_decimal
 
 from webhelpers2.html import tags, HTML
 
 from tailbone.views import MasterView
 
 
-def render_shift_length(shift, field):
-    if not shift.start_time or not shift.end_time:
-        return ""
-    if shift.end_time < shift.start_time:
-        return "??"
-    length = shift.end_time - shift.start_time
-    return HTML.tag('span', title="{} hrs".format(hours_as_decimal(length)), c=[pretty_hours(length)])
+class ShiftViewMixin:
+
+    def render_shift_length(self, shift, field):
+        if not shift.start_time or not shift.end_time:
+            return ""
+        if shift.end_time < shift.start_time:
+            return "??"
+        app = self.get_rattail_app()
+        length = shift.end_time - shift.start_time
+        return HTML.tag('span',
+                        title="{} hrs".format(hours_as_decimal(length)),
+                        c=[app.render_duration(delta=length)])
 
 
-class ScheduledShiftView(MasterView):
+class ScheduledShiftView(MasterView, ShiftViewMixin):
     """
     Master view for employee scheduled shifts.
     """
@@ -78,20 +79,20 @@ class ScheduledShiftView(MasterView):
 
         g.set_sort_defaults('start_time', 'desc')
 
-        g.set_renderer('length', render_shift_length)
+        g.set_renderer('length', self.render_shift_length)
 
         g.set_label('employee', "Employee Name")
 
     def configure_form(self, f):
         super(ScheduledShiftView, self).configure_form(f)
 
-        f.set_renderer('length', render_shift_length)
+        f.set_renderer('length', self.render_shift_length)
 
 # TODO: deprecate / remove this
 ScheduledShiftsView = ScheduledShiftView
 
 
-class WorkedShiftView(MasterView):
+class WorkedShiftView(MasterView, ShiftViewMixin):
     """
     Master view for employee worked shifts.
     """
@@ -136,7 +137,7 @@ class WorkedShiftView(MasterView):
         # (but we'll still have to set this)
         g.set_sort_defaults('start_time', 'desc')
 
-        g.set_renderer('length', render_shift_length)
+        g.set_renderer('length', self.render_shift_length)
 
         g.set_label('employee', "Employee Name")
         g.set_label('store', "Store Name")
@@ -154,7 +155,7 @@ class WorkedShiftView(MasterView):
         f.set_readonly('employee')
         f.set_renderer('employee', self.render_employee)
 
-        f.set_renderer('length', render_shift_length)
+        f.set_renderer('length', self.render_shift_length)
         if self.editing:
             f.remove('length')
 
@@ -162,7 +163,7 @@ class WorkedShiftView(MasterView):
         employee = shift.employee
         if not employee:
             return ""
-        text = six.text_type(employee)
+        text = str(employee)
         url = self.request.route_url('employees.view', uuid=employee.uuid)
         return tags.link_to(text, url)
 
diff --git a/tailbone/views/shifts/lib.py b/tailbone/views/shifts/lib.py
index d32a1309..8fc58264 100644
--- a/tailbone/views/shifts/lib.py
+++ b/tailbone/views/shifts/lib.py
@@ -31,7 +31,7 @@ import sqlalchemy as sa
 from rattail import enum
 from rattail.db import model, api
 from rattail.time import localtime, make_utc, get_sunday
-from rattail.util import pretty_hours, hours_as_decimal
+from rattail.util import hours_as_decimal
 
 import colander
 from deform import widget as dfwidget
@@ -401,6 +401,8 @@ class TimeSheetView(View):
         Fetch all shift data of the given model class (``cls``), according to
         the given params.  The cached shift data is attached to each employee.
         """
+        app = self.get_rattail_app()
+
         # TODO: a bit hacky, this?  display hours as HH:MM by default, but
         # check config in order to display as HH.HH for certain users
         hours_style = 'pretty'
@@ -465,7 +467,7 @@ class TimeSheetView(View):
                 hours = empday['{}_hours'.format(shift_type)]
                 if hours:
                     if hours_style == 'pretty':
-                        display = pretty_hours(hours)
+                        display = app.render_duration(hours=hours)
                     else: # decimal
                         display = str(hours_as_decimal(hours))
                     if empday['hours_incomplete']:
@@ -476,7 +478,7 @@ class TimeSheetView(View):
             hours = getattr(employee, '{}_hours'.format(shift_type))
             if hours:
                 if hours_style == 'pretty':
-                    display = pretty_hours(hours)
+                    display = app.render_duration(hours=hours)
                 else: # decimal
                     display = str(hours_as_decimal(hours))
                 if hours_incomplete: