Hi Kelz,
If you're on slimming world, I've set up a 6 month zumba/weight loss challenge. You can find it here
http://www.minimins.com/slimming-world-teams/212812-team-zumba-six-month-challenge.html
My mum doesn't diet (she's dead skinny anyway!) but she's being doing zumba a month and lost a couple of lbs. So that's coming from someone whose got nothing to lose
The general recommendation is to do it twice a week or more in order to actually see weight loss results.
Hope you fall as in love with it as I have