diff --git a/Changes b/Changes
index 68db4a5b..97a189f3 100644
--- a/Changes
+++ b/Changes
@@ -4,6 +4,7 @@
 
   * Node Montior is now included in Admin menu
   * #48 Node Monitor supports matching on OUI
+  * #31 Configurable Free Time in Port Utilization Report
 
 2.039015 - 2018-03-05
 
diff --git a/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm b/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm
index a37c383a..f08bac65 100644
--- a/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm
+++ b/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm
@@ -11,10 +11,15 @@ __PACKAGE__->table('port_utilization');
 __PACKAGE__->result_source_instance->is_virtual(1);
 __PACKAGE__->result_source_instance->view_definition(<<ENDSQL
  SELECT d.dns AS dns, d.ip as ip,
-     sum(CASE WHEN (dp.type != 'propVirtual') THEN 1 ELSE 0 END) as port_count,
-     sum(CASE WHEN (dp.type != 'propVirtual' AND dp.up_admin = 'up' AND dp.up = 'up') THEN 1 ELSE 0 END) as ports_in_use,
-     sum(CASE WHEN (dp.type != 'propVirtual' AND dp.up_admin != 'up') THEN 1 ELSE 0 END) as ports_shutdown,
-     sum(CASE WHEN (dp.type != 'propVirtual' AND dp.up_admin = 'up' AND dp.up != 'up') THEN 1 ELSE 0 END) as ports_free
+     sum(CASE WHEN (dp.type != 'propVirtual') THEN 1
+              ELSE 0 END) as port_count,
+     sum(CASE WHEN (dp.type != 'propVirtual' AND dp.up_admin = 'up' AND dp.up = 'up') THEN 1
+              ELSE 0 END) as ports_in_use,
+     sum(CASE WHEN (dp.type != 'propVirtual' AND dp.up_admin != 'up') THEN 1
+              ELSE 0 END) as ports_shutdown,
+     sum(CASE WHEN (dp.type != 'propVirtual' AND dp.up_admin = 'up' AND dp.up != 'up'
+                    AND ( age(now(), to_timestamp(extract(epoch from d.last_discover) - (d.uptime - dp.lastchange)/100)) > ?::interval  )) THEN 1
+              ELSE 0 END) as ports_free
    FROM device d LEFT JOIN device_port dp
      ON d.ip = dp.ip
    GROUP BY d.dns, d.ip
diff --git a/lib/App/Netdisco/Web/Plugin/Report/PortUtilization.pm b/lib/App/Netdisco/Web/Plugin/Report/PortUtilization.pm
index 124519c6..399ee51e 100644
--- a/lib/App/Netdisco/Web/Plugin/Report/PortUtilization.pm
+++ b/lib/App/Netdisco/Web/Plugin/Report/PortUtilization.pm
@@ -16,7 +16,11 @@ register_report(
 
 get '/ajax/content/report/portutilization' => require_login sub {
     return unless schema('netdisco')->resultset('Device')->count;
-    my @results = schema('netdisco')->resultset('Virtual::PortUtilization')->hri->all;
+
+    my $age_num = param('age_num') || 3;
+    my $age_unit = param('age_unit') || 'months';
+    my @results = schema('netdisco')->resultset('Virtual::PortUtilization')
+      ->search(undef, { bind => [ "$age_num  $age_unit" ] })->hri->all;
 
     if (request->is_ajax) {
         my $json = to_json (\@results);
diff --git a/share/config.yml b/share/config.yml
index 487d7258..93fb71a1 100644
--- a/share/config.yml
+++ b/share/config.yml
@@ -144,6 +144,9 @@ sidebar_defaults:
   report_moduleinventory:
     fruonly:     { default: checked }
     matchall:    { default: checked }
+  report_portutilization:
+    age_num:      { default: 3 }
+    age_unit:     { default: months }
 device_port_col_idx_left: 0
 device_port_col_idx_mid: 2
 device_port_col_idx_right: -1
diff --git a/share/views/sidebar/device/ports.tt b/share/views/sidebar/device/ports.tt
index 5897ffbe..1a4224ec 100644
--- a/share/views/sidebar/device/ports.tt
+++ b/share/views/sidebar/device/ports.tt
@@ -112,7 +112,7 @@
                   <li>
                     <em class="muted">Mark as Free if Down for:</em><br/>
                     <select id="nd_days-select" name="age_num">
-                      [% FOREACH count IN [1..32] %]
+                      [% FOREACH count IN [1..31] %]
                       <option[% ' selected="selected"' IF vars.sidebar_defaults.device_ports.age_num == count %]>[% count %]</option>
                       [% END %]
                     </select>
diff --git a/share/views/sidebar/report/portutilization.tt b/share/views/sidebar/report/portutilization.tt
new file mode 100644
index 00000000..2dc17336
--- /dev/null
+++ b/share/views/sidebar/report/portutilization.tt
@@ -0,0 +1,19 @@
+
+            <p class="nd_sidebar-title"><em>Port Utilization</em></p>
+            <div class="clearfix">
+              <em class="muted">Mark as Free if Down for:</em><br/>
+              <select id="nd_days-select" name="age_num">
+                [% FOREACH count IN [1..31] %]
+                <option[% ' selected="selected"' IF vars.sidebar_defaults.report_portutilization.age_num == count %]>[% count %]</option>
+                [% END %]
+              </select>
+              <select id="nd_age-select" name="age_unit">
+                [% FOREACH unit IN [ 'days', 'weeks', 'months', 'years' ] %]
+                <option[% ' selected="selected"' IF vars.sidebar_defaults.report_portutilization.age_unit == unit %]>[% unit %]</option>
+                [% END %]
+              </select>
+            </div>
+
+            <button id="[% report.tag %]_submit" type="submit" class="btn btn-info">
+             <i class="icon-search icon-large pull-left nd_navbar-icon"></i> Run Report</button>
+