With a normal straight that is nice and sharp, I can usually do a three pass and get DFS with BBS in most areas. To get the last bit requires magic and a special corn dance at midnight - so I only do it during the Solstice and with lots of grain alcohol. I can use a Feather AC with a new blade and get near BBS with two passes. With a regular straight, I do the normal wtg, xtg, atg. With the Feather, I do wtg and a combination of xtg (cheeks) and atg (neck).
However, I get obsessed at times and probably do a couple of mini-me passes without lather to touch-up things - especially with a regular straight.
If I do more than three passes with a regular or more than two with a Feather, I will usually get a bit of razor burn. I can tell if I was naughty because my first splash is Canoe scented alcohol. Whhoooo boy, will that wake you up if you over do it!
Inventor of the world's first safety vibrating Kamisori with night light. Go to http://badgerandblade.com/vb/showthread.php/299465-A-milder-Kamisori: Inventor of the Weckisori - (thanks sychodelix)