Just completed my first game at Hard level - I started about twelve, so these stats are for posterity. No time warps or cheats.

Game varied between fast (sitting in the cradle beside me), slow (actually doing some work) and pause (catching some zzzs).

Puzzle #1 23 Hours
Puzzle #2 27 Hours
Puzzle #3 94 Hours
Puzzle #4 81 Hours
Puzzle #5 87 Hours
Puzzle #6 105 Hours
Puzzle #7 54 Hours
Puzzle #8 199 Hours
Puzzle #9 124 Hours
Puzzle #10 169 Hours
Puzzle #11 174 Hours
Puzzle #12 158 Hours

Total Real Time Played 174
Villagers Born 68
Villagers Cured 47
Villagers Buried 6
Oldest Villager 70
Max Village Population 65
Food Harvested 128588
Crabs Caught 1028
Total Tech Points Earned 652957
Tech Levels Completed 12
Island Events 10
Puzzles Solved 12 of 12

Current population 65, current food level 1446 - I was concentrating on getting the last of the tech so they went a bit hungry - but then given how hard it was to keep them fed, they're used to growing weak from hunger.

I think I might leave it to run on fast overnight with everyone farming - just to see how high I can get the food level