Can you leave class D amps on and not ever turn them off?

Thanks for all the responses.  
They are a little mixed.
The concensus seems to be to leave them on.
I've in the past always turned them on and off, and have had trouble with one balking at startup.

George,

You mention NuForce 8 monoblocks as having gone up in smoke.
Would you suspect the Nuforce 9's as having  the same problem?

Thank you for your reply, George.
I own the original Nuforce 9's and have kept switching them on and off for years.
i guess I'll continue to do so, even though, for a brief period, I left them on and didn't have the annoyance of waiting for them to warm up.

Oh well.....