I usually check it early and then sometime during the day.
Just to send Thanks if anything was posted.
It seemed to be unwritten forum etiquette by others when I joined.
I continue the etiquette and other newer members mostly follow the example of others as I did.
When I get a Thank You from given rep two or three days later almost if not all have sent me a "Sorry just noticed...." or similar VM.
I have given two reps since last August and received no acknowledgment.
That is an excellent indication of a great group of people and a very polite forum.