# Ability to reference time range bucket From: and To: in query/visualisation? **URL:** \ **Category:** Kibana\ **Created:** [May 8, 2017, 10:13am UTC](https://discuss.elastic.co/t/ability-to-reference-time-range-bucket-from-and-to-in-query-visualisation/84915 "2017-05-08T10:13:25Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![LeeDr](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leedr/32/9289_2.png) [@LeeDr](https://discuss.elastic.co/u/LeeDr)\ **Post date:** [May 8, 2017, 2:00pm UTC](https://discuss.elastic.co/t/ability-to-reference-time-range-bucket-from-and-to-in-query-visualisation/84915/2 "2017-05-08T14:00:50Z")
Hi Lee, can you please check this post and see if it helps you? > [@Display concurrency in data on Kibana](https://discuss.elastic.co/t/display-concurrency-in-data-on-kibana/26006): > > I have fields with start date and duration (seconds) representing start and duration of a phone call. I would like to define concurrency (a number) when the same destination (also a field) is active within the same duration. That is if a ncall starts now for 30 seconds and another call to the same destination starts 15 seconds into the first call, concurrency should be 2 for the remaining 15 seconds. How do I define this in Kibana visualization as a line graph over time? Regards, Lee --- _[View the full topic](https://discuss.elastic.co/t/ability-to-reference-time-range-bucket-from-and-to-in-query-visualisation/84915)._