You make more money playing for value than bluffing
in cash games, it's the opposite in tournaments.
My bluff range is about 30% of my range when in late position, although I don't necessarily continue with all of it and a lot of my value range turns into bluffs.
OOP the only time I start a bluff pre-flop is in blind defence and for that that BTN or CO have to be stealing pretty wide.
I also blind steal relentlessly which could be viewed as bluffing.
Post-flop, it really depends on the SPR, if I'm OOP and the SPR is low then very frequently, if I pick up say 5 outs, with an SPR of >3 my bluff % is really high, similarly if the SPR is 10 I'm basically never bluffing OOP unless I'm against a complete idiot because there's too much they can do.
There's also stuff like cbets and betting draws, which is just so standard that I do it a lot.
When IP I've got more bluff hands in my range but I'm not really bluffing that much, or at least, it's not about running big bluffs, it's frequently a combination of factors, say I float on the flop then it's usually because I've got some outs as well as the chance he gives up. Also, usually I'm not actually raising much post-flop when IP (betting a fair bit when checked to though) purely because of SPR, when OOP I'll influence the SPR to be low so it will favour a lot of bluffs and IP it's high to favour multi-street play which frequently doesn't help with fold equity.
If you're talking though about situations where I have no outs and am making a large bluff, not very often. Maybe once or twice per 1k hands.
Hopefully all of that made sense... if not, I'm going to default to the answer I dislike: It depends.