Does it?
If you do it regularly like thrice a week?
If yes, how regularly should I do it and for how long each time? Half an hour?
Also, what distance should I ride it?
biking will help u lose weight and the rest depends on u... i would say 1.5 hour of biking every 5 days and leave the other 2 as a rest day.. distance should be the same as 1.5 hours