stop recording

I am recording LPs from a turntable which does not have an automatic stop at the end of a record side. I can’t find anyway to do this in Audacity; can I do this please

you can use the Timer Record function to facilitate this - see this page in the Manual:

Note that you would need to initiate the recording prior to the needle drop - and allow an extra buffer at the end unless you know exactly how long the LP is.