My mugs hold about 10 0z., and I start the day with a cup (I'm no earthly good until I've had a shower and a cup of coffee, in that order). I may have a second one mid morning, and if so, I'll end up sipping, and when it get cold, nuke it. Sip, let sit and maybe repeat several times until it's gone. Except for Thursdays when I have a regular breakfast with a couple of other pastors. We eat, talk, and drink coffee, and that coffee mug never really runs dry until we're ready to leave 1 1/2 later. So that's likely at least a 3 cup morning.
I confess that I do need to drink more H2O.