Tracked the same day, paid within the month
I deposited the required 20 quid, carefully bet the required amount on games which had practically finished already and which gave an odds of 1/100 (1.01 if you switch to decimal view). Made a couple of percent profit on my deposit and withdrew it a day later.
I just got the cashback arrive about 3 weeks later.
If you're into sport betting, the options here look good. The site's quite easy to use.