Deprecation schedule

[Andrei Alexandrescu]

I wonder what would be a good deprecation schedule. Consider 
http://d.puremagic.com/issues/show_bug.cgi?id=5257 as an example.

We should now slowly deprecate std.utf.count. How should we go about it?
T0: documentation marked as "scheduled for deprecation".
T1: Function is deprecated and documentation updated to mention "has 
been deprecated"
T2: Function is eliminated

Question is, what are some good values for T1 - T0 and T2 - T1?


Andrei