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To be honest I've not seen it (I'm sure there must be some out there with it). It seems like a failure-prone feature to add, you could need a pretty high torque motor to deal with the cases when you're switching from filter to espresso grind with some bits of bean stuck between the burrs.
Wouldn't rule it out, but between working in coffee shops and researching grinders for home use, it's not a feature I've spotted.
Apologies for the long-winded non-answer!
No. Not timer. Grind settings, so 1 for espresso and then caffatiere etc. Soes that exist?