diff --git a/classes/studyitem.php b/classes/studyitem.php
index 95d0c92..48b5c1a 100644
--- a/classes/studyitem.php
+++ b/classes/studyitem.php
@@ -191,7 +191,7 @@ class studyitem {
     public static function add($fields,$import=false)
     {
         global $DB;
-        $addable = ['line_id','type','layer','conditions','slot','competency_id','course_id','badge_id','continuation_id'];
+        $addable = ['line_id','type','layer','conditions','slot','competency_id','course_id','badge_id','continuation_id','span'];
         $info = [ 'layer' => 0, ];
         foreach($addable as $f){
             if(array_key_exists($f,$fields)){
@@ -210,7 +210,7 @@ class studyitem {
     public function edit($fields)
     {
         global $DB;
-        $editable = ['conditions','course_id','continuation_id'];
+        $editable = ['conditions','course_id','continuation_id','span'];
 
         $info = ['id' => $this->id,];
         foreach($editable as $f){
diff --git a/classes/studyplanservice.php b/classes/studyplanservice.php
index afb5665..f2a4e95 100644
--- a/classes/studyplanservice.php
+++ b/classes/studyplanservice.php
@@ -658,7 +658,6 @@ class studyplanservice extends \external_api
  
     public static function include_grade($grade_id,$item_id,$include,$required=false)
     {
-        // TODO: DEPRECATE THIS WHEN IMPLEMENTING THE CORE COMPLETION STRATEGY
         global $USER;
 
         // find related course and course context
@@ -1192,6 +1191,7 @@ class studyplanservice extends \external_api
              "page_id" => new \external_value(PARAM_INT, 'Studyplan page id'),
              "period" => new \external_value(PARAM_INT, 'Period number within page'),
              "course_id"=> new \external_value(PARAM_INT, 'Id of course to adjust dates for'),
+             "span"=> new \external_value(PARAM_INT, 'Period span (default 1)',VALUE_DEFAULT),
          ]);
      }
  
@@ -1199,17 +1199,21 @@ class studyplanservice extends \external_api
      {
          return success::structure();
      }
-     public static function course_period_timing($page_id, $period, $course_id){
+     
+     public static function course_period_timing($page_id, $period, $course_id, $span=1){
         $course = \get_course($course_id);
         $coursecontext = \context_course::instance($course_id);
         $page = studyplanpage::findById($page_id);
         // Check for studyplan edit permissions
         webservicehelper::require_capabilities(self::CAP_EDIT,$page->studyplan()->context());
 
+        // Determine end period number
+        $endperiod = $period + ($span -1);
+        // Get the proper list of periods for this page
         $periods = period::findForPage($page);
         if(array_key_exists($period,$periods)){
             $pstart = $periods[$period];
-            $pend = $periods[$period];
+            $pend = $periods[$endperiod];
 
             if(webservicehelper::has_capabilities("moodle/course:update",$coursecontext)){
                 // Actually perform the timing changes, while also updating the module times
@@ -1223,8 +1227,6 @@ class studyplanservice extends \external_api
             
                 ]);
 
-                // TODO: parse status
-
                 return success::success()->model();
             } else {
                 // probably should return a nice message