block of time might be you know a window of time around when bars close on a Friday or Saturday evening so why is that important in many ways what I want to focus on here is not I want to avoid talking about predictable changes in demand okay so everybody knows there's going to be more demand around rush hour than there is in the afternoon alright so I want to avoid that and indeed the platform's avoid that so even even before surge pricing became sort of something which is changing at a minute-to-minute basis you