Which contract should I supply the boat?

Contracts:

5 min.   - 100 coins- 25 supplies - cost per supply 4- supplies by hour 300

4 hours - 350 coins- 200 supplies- cost per supply 1.75- supplies by hour 50

8 hours - 500 coins- 300 supplies- cost per supply 1.67- supplies by hour 38

12 hours- 600 coins- 400 supplies- cost per supply 1.5- supplies by hour 33

24 hours- 800 coins- 600 supplies- cost per supply 1.33- supplies by hour 25

48 hours- 1200 coins- 1000 supplies- cost per supply 1.2- supplies by hour 21

It depends on your availability for the game, but here are some tips:

• 5 minutes contracts takes a lot of energy and they are expensive. Only worthy when you have extra coins and neighbors clicking on the boats.
• 48 hours contracts takes few energy, they are cheap but you get few supplies in this time. This is the best option for a starter in the game.
• if you play during the day, the best contract is 4 hours (except if you are a starter) and at night you choose the 8 or 12 hours contract.