Depends entirely on guitar.
On most guitars I use a custom set that has 9 tops but 11 bottoms, 9 to 50 or 52.
One Yamaha shredder I keep 9-42 and it's reserved for like crazy fast recording riffs, otherwise it's way too lax to play.
On a couple of 'em I have 9,5 sets (GHs) and on one gibby scale I usually use a 10 set. 13 on acoustic.
It's been getting this thin in recent years, when I had just a few guitars I used .11 - 52 sets on them.
Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.