Maximum number of skill-enhancement feats?

[Driddle]

Potential feats ...

Great Pretender: +2 Bluff, +2 Disguise
Silvertongued: +2 Bluff, +2 Diplomacy
Knock-off Product Manufacturer: +2 Bluff, +2 Craft
Rumormonger: +2 Bluff, +2 Gather Information
(etc.) ... And, of course, the infamous Skill Focus, +3 Bluff


Silly though my examples might seem, I'm using them only to frame a question: How many (hopefully legitimate) feat-related skills bonuses would you allow a player to accumulate in one skill?

 

[Scion]

as many as they have feat slots they wish to use for it? so long as they are feats I allow in my game of course.

 

[MichaelH]

If a player wants to spend his feat slots to boost one or two skills, that's alright. These skill focus feats are unnamed bonuses, so they legitimately stack.