I agree with everything PiperArcher said.
A basic and happy fact of owning a share, is that if you've booked it, and what you want to do with that slot is take a deck chair out into the airfield, and sit and admire it for the morning, that is entirely legitimate. Very rarely are syndicate aeroplanes so heavily booked that you ever find yourself constrained into 2 hours slots, inability to night stop, and so-on. You also all know each other, so if things are running into another booking, it's usually possible to phone their mobile, apologise, and sort it out.
The other option, if renting, is just always book the slightly more expensive aeroplane in the club - and odds are there is nobody waiting for it after you. Many clubs you'll find the C152s used constantly, the C172 or Warrior fairly regularly, and for another £10/hr, something like a 182 or Arrow that often doesn't fly one day to the next.
G