I'm looking at possibly buying a fs100 second hand. I've seen one with 11x10 hours use. Is that 110 hours? I used to have a sony pd170 and I can't remember if it recorded use that way also.

Yes, that's more or less nothing as the FS100 has no moving parts.
I bought one used with more than 500 hours and it's still fine!

In suspect the counter clocking up in clumps of ten is just a way to make the maximum available on the counter more, without clocking around to 000.

thanks! i guess the camera should be good for hundreds of hours more use.