Now of course it would depend very much on and whether you were in a drought situation as we were until last year or whether it's like we've been over this last summer and early winter which is that virtually not a day has passed without we've had some rain, in which case obviously the roof is going to get cleaned up very much quicker but I have to say that although I've always been under the impression that it's not a good idea to save water off a new felt roof er because of deposits that come off the mineral felt.