- Generally you can carefully (or recklessly, now there's an undo button) use the Restaurant combined with resting to safely rack up time overfilled at the cost of gold.
- Using one of the stretchy items, filling up to capacity, then letting the effect wear off will also leave you with lots of time overfilled, and is usually the method I tend to use when I can.
- You can grind XP to level and choose to upgrade stomach capacity.
- You can also turn in Wyvern Eggs to the cabal and choose to upgrade your stomach capacity for a gain very close to what you'd get for levelling up.
- In Options, there's the Cheat menu available down at the bottom that lets you edit your stats. The game isn't necessarily all that grind-friendly, so it's a good option to use even if you are playing "legit" to save time on the more tedious parts (though you've got to draw lines somewhere, since technically everything is infinitely achievable with just time being the barrier). Figure out some rules for conversions and use those to skip the tedious parts.
- Fat to Gold: 1.5 fat gained per 1 Gold (based on buying and eating cake, although this conversion is currently 6 times as efficient because of a bug - exploiting the bug makes it more 9 fat per 1 Gold)
- Fat to Stats: 10 Fat translates to 1 stat point, plus 1/3rd of an Endurance stat point if the training is physical (i.e. not INT).
- (Not worked out how much a stretchy fruit or similar translates into stomach training yet)