How to set streaming audio record time Win10

My guess is that this post is not the first on the subject of how to set a specified record time. After a reasonable amount of reading the manual and experimenting, I can not determine how to simply set a length of time for recording streaming audio. Yes I see the duration boxes lower left. No matter which one I chose, no matter the times in either box I can not figure it out. I must assume its easy to do but someone give me some help on this. Alternatively, it may not be working properly or the duration boxes have nothing to do with setting a specified time to record. Thanks for reading.

Please see: https://manual.audacityteam.org/man/timer_record.html

WC