I agree with Andy, 25 secs is too short. Its not just about drying off sweat or bouncing the ball xx no. times. It also includes if they bust a string on the racquet and have to get a new one.
Nadal will have loads of problems adapting to this, he uses load o time. But I've seen the top players treated more leaniently re: time warnings, than others, previously.
A rule is a rule and should be applied to all.
There's probably going to be some heated moments on court in the AO beacuse of this with temperatures soaring, long rallies and 5 setters.
They should listen to Andy!
The rule doesn't apply to the slams, or rather, the slams have their own rules for how long the players get between points. I believe in the slams it is 20 seconds.
I think Andy is right, the time allowed should be 30 seconds, but that should be enforced, and right across the board too, rather than applied at the umpire's discretion to some players and then allowing those at the top to get away with it. At the very least I think the time allowed between points in the slams should be the same as in other tournaments.