If you wait more than one day since your last collection, then you will get 12% of your available cash as interest for every day past the 2nd that you collect. This is capped at 10k though.
eg.
It has been 1 day since you collected. You get $0 interest.
eg.
It has been 2 days since you collected, and you have $50k lying around. You get 50000 * 0.12 = $6000 interest if you collect
eg.
It has been 5 days since you collected, and you have $40k lying around. You get 40000 * 0.12 * 4 = $19200. The cap is $10000 though, so you only get $10000 interest.
The most you can earn from this is $5000 per day if you collect every 2nd day and have $84k cash when you collect.