do you mean film speed or development time?
i don't care much about the time it takes to develop my film/paper. but gaining one stop in film speed, i would be very interested in...

i'm using selfmixed xr-1 for my low light photography. which already has the superactivity of phenidone plus hydroquinone. so would adding urea or the secret ingredient allow me even higher asa-ratings? (normally i use trix or hp5 at 800 - 1600asa)