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Your licence is valid for a period of 5 years.
Your rating to fly single engine piston aeroplanes is valid for 2 years. You need to fly 12 hours (6 of which must be p1, 1 hr dual with an instructor) in the last 12 months of this period for the licence to be revalidated 'by experience'.
If however, during this period you haven't flown for a period, to fly passengers you will need to have completed 3 take-off and landings within the last 90 days. Thats the rules of the land.
Club rules vary but are ususally a 'check-ride' if you haven't flown within the last 30 days.