diff --git a/app/assets/stylesheets/_admin.scss b/app/assets/stylesheets/_admin.scss
index 1e480f9..cdc2e08 100644
--- a/app/assets/stylesheets/_admin.scss
+++ b/app/assets/stylesheets/_admin.scss
@@ -1393,6 +1393,7 @@ nav.sub-menu {
             position: absolute;
             top: 0;
             right: 0.25em;
+            z-index: 2;
 
             ul {
                 width: 15em;
diff --git a/app/assets/stylesheets/_application.scss b/app/assets/stylesheets/_application.scss
index 7d30198..4d14697 100644
--- a/app/assets/stylesheets/_application.scss
+++ b/app/assets/stylesheets/_application.scss
@@ -2060,6 +2060,12 @@ table.schedule {
             white-space: nowrap;
             text-align: right;
         }
+
+        .row-type-nil {
+            th {
+                color: $almost-light-gray;
+            }
+        }
     }
 
     &.locations-1 td.workshop.filled {
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 9e9ee2c..184ff24 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -472,15 +472,15 @@ class ApplicationController < BaseController
 
     @schedule.deep_dup.each do |day, data|
       data[:times].each do |time, time_data|
-        if time_data[:next_event].present? || time_data[:length] > 0.5
-          span = 0.5
+        if time_data[:next_event].present? || time_data[:length] > @this_conference.schedule_interval
+          span = @this_conference.schedule_interval
           length = time_data[:next_event].present? ? time_data[:next_event] - time : time_data[:length]
           while span < length
             @schedule[day][:times][time + span] ||= {
               type: (span >= time_data[:length] ? :empty : :nil),
-              length: 0.5
+              length: @this_conference.schedule_interval
             }
-            span += 0.5
+            span += @this_conference.schedule_interval
           end
         end
       end
diff --git a/app/views/conference_administration/_schedule.html.haml b/app/views/conference_administration/_schedule.html.haml
index f2157ad..b8d8815 100644
--- a/app/views/conference_administration/_schedule.html.haml
+++ b/app/views/conference_administration/_schedule.html.haml
@@ -17,8 +17,8 @@
                     %th=location.is_a?(Symbol) ? '' : _!(location.title)
             %tbody
               - data[:times].each do |time, time_data|
-                %tr
-                  - rowspan = (time_data[:length] * 2).to_i
+                %tr{class: "row-type-#{time_data[:type] || 'nil'}"}
+                  - rowspan = (time_data[:length] * (1 / @this_conference.schedule_interval)).to_i
                   %th=time(time).html_safe
                   - if time_data[:type] == :workshop
                     - data[:locations].each do |id, location|
diff --git a/app/views/conference_administration/_workshop_times.html.haml b/app/views/conference_administration/_workshop_times.html.haml
index d0e0c71..2d4b51f 100644
--- a/app/views/conference_administration/_workshop_times.html.haml
+++ b/app/views/conference_administration/_workshop_times.html.haml
@@ -11,7 +11,7 @@
       = form_tag administration_update_path(@this_conference.slug, @admin_step), class: ['table-tr', is_new ? 'new' : 'saved'] do
         .table-th.center.big= is_new ? '' : (block + 1)
         .table-td=hour_select info['time'], small: true, label: false
-        .table-td=length_select info['length'], {small: true, label: false}, 0.5, 2
+        .table-td=length_select info['length'], {small: true, label: false}, 0.5, 2, @this_conference.schedule_interval
         .table-td=checkboxes :days, @block_days, info['days'].map(&:to_i), 'date.day_names', vertical: true, small: true
         .table-td.form
           = hidden_field_tag :workshop_block, block