I simply dry at ambient temperature for at least four days. Sometimes I lose track and some pollen goes longer. Generally if I'm not in too big of a hurry I'll write on the pollen packet the number of days it was dried. Some have gone as long as nine days but I have just recently begun tracking this so can't relate results.
The last couple of seasons I have left the pollen on the anther, you just want to make sure it is dry. I assume it is after the minimum four days.
The nice thing about using foil or even the centrifuge tubes is that they are easy to open and do a quick dip with a Q-tip then close up again.
My dining table is pretty much dedicated to drying pollen and labeling and pretty much every thing else plants, even potting up some things (e.g. veggie starts). I read somewhere that it is healthier to eat standing up
!
