Part 91 recurrent training
Flyman,
What kind of airplane are you talking about? If you are flying a jet, or any aircraft requiring 2 pilots, FAR Part 61.58 will give you your answer. One must have had a proficiency check on an aircraft requiring 2 pilots in the preceding 12 months and completed a proficiency check on that type aircraft in the preceding 24 months.
So if you have a type rating on 2 different jets you can alternate recurrent training on each type every other year (if your insurance company allows it). However if you are only typed in 1, you must get a proficiency check on the airplane every 12 months.
P