If you use 1L of Perceptol stock then even with 35mm film you can't get more than 4 films at 250mls per films. At least I don't know of any tank that needs less than 250mls for a 35mm film unless you do Jobo rotary processing when you might get 7 films at 140 mls per film.

Either way at 1-2 films per month you need the Perceptol to last 7 months max. If you decant the stock into winebags then you will easily get 7 months out of Perceptol.

Based on this I'd develop each film as soon as it has been exposed. Instant satisfaction and no issues with latent image etc