Randy:
There is really no 'Rule of Thumb' when it comes to how many coins a machine will hold, as
most models vary greatly. Just an average machine with a jackpot, works as such: First, the
payout slides & coin tube will fill. The overflow from the full tube, will then start filling the
main jackpot & reserve jackpot. When those are full, then the excess will go into the coin-box.
If you have a machine that pays out more often than not, it will take longer to fill everything.
As for your Jennings "Governor" Tic-Tac-Toe, they have a humongous coin-box, that will hold
more coins than I care to count. Especially with yours being dime play, you may need a forklift
to remove a full box from the machine!
I kept a penny one in the garage for years, for my Kids, and their friends to play, and I don't
ever remember emptying the coin-box, until I sold it.
Just keep pumping those dimes in, and eventually you will start hearing that "plink-plank"
sound, as they start to enter that noisy-tin-coin-box. After the bottom gets covered with a
half inch or so of coins, it will then quiet-down. Happy playing!
Bill