Seems 20 percent is the standard offering. Got the same on my IndusInd Legend. As my existing limit was a good 400000, has worked out alright. IndusInd doesn't offer limit increase all that much. In more than 3 years, this is the 2nd time I got. The first was part of a card upgrade offer, from Platinum to Legend. So take the offer, rather than waiting, might end up as a very long one at that otherwise.