Load testing configured using Ultimate thread for 100users and 1 hr is keep going after the duration is completed

Hi All,

I have configured Load testing in Jmeter using the Ultimate thread with the 25, 25, 25, 25 thread s. The table given below outlines a gradual increase in users, with each group being started, maintained, and stopped at specific intervals.

As per configuration it should be completed in 1hr 38 minutes but it was keep running after 2 hrs so i stopped manually. Please suggest why this is happening?

Thanks,
Archana