I him my pw 135, 54 115 and 58 95yds. I replace my 54 and 58 yearly.

I would say ideally you would want 3-5* difference in all of your wedges.  A big thing that matters is how well you handle them on partial swings.  If you can handle them well on half swings you should have every yardage covered.  I stick with a 50,54, and 58* in my wedges and change them every year. 

NICK AND JOSH...WHAT IS YOUR HDCP?

HOW OFTEN DO YOU PLAY? HOW MANY MONTHS A YEAR?

I WOULD THINK IT WOULD TAKE A COUPLE OF MONTHS JUST TO GET THE FEELING OF NEW WEDGES,,,AND THEN CHANGE THEM OUT EVERY YEAR. YOU BOTH MUST BE VERY GOOD PLAYERS.

DOGLOSKI -  I'm a 0 and play year round.  I play approx 1 / week and try and practice 1 time per week.  My theory on switching wedges is that I try and buy my new ones in Dec / Jan and break them in slowly.  I mostly hit balls with them for the first few weeks and try and gague my yardages.  I will bend them if necessary to keep my yardages where I like them.  Switching every other year is not a bad thing, I would switch when you see your ball not reacting like you want it to on the greens.  Good Luck.

NICK AND JOSH...WHAT IS YOUR HDCP?

HOW OFTEN DO YOU PLAY? HOW MANY MONTHS A YEAR?

I WOULD THINK IT WOULD TAKE A COUPLE OF MONTHS JUST TO GET THE FEELING OF NEW WEDGES,,,AND THEN CHANGE THEM OUT EVERY YEAR. YOU BOTH MUST BE VERY GOOD PLAYERS.

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I am a low single digit handicap.  I play year round and will play and or practice short game a few times a week.  I dont wear out my wedges but just like the looks of a new set to start out the year.