Description of problem:
Version-Release number of selected component (if applicable):
v3.8.10-1 on devel server
Steps to Reproduce:
1.open a test run :https://tcms-devel.app.eng.nay.redhat.com/run/72405
2.then click clone button and input estimated time as 1:10:30
3.save the clone and then check the result.
step3 :it happened 500 error after saving the cloned test run.
it should prompt a warning msg:Enter a valid estimated time. e.g. 12h45m
verify this issue on v3.8.10-1 on devel.--->Pass
verify steps are same as description.