I'm using firefox addon that check my email every 5/mins so as long as i'm online it check out my email once got new email, i it will gives me an alert..
I have both gmail and Ymail. I check my Ymail as often as possible a day but i check my gmail maybe 5times a week.
Every now and then specially when I'm online. Usually answering to questions and replying to personal emails..
I will check immediately after rising from my bed in the morning and also check b4 going to bed during night.