> Here's my attempt to answer my own questions.
>
> Timer0 can be either 8 or 16 bits.  So I think I want 16 bits...and the
> largest prescalar is 256.
> OK...so if I use a 4Mhz clock...
>
> -16 bits counts to 65,535.

Close. 16-bit count is 65536 -> 16,777,216 with /256 pre-scale,
which is 4.194304s @ 4MHz internal clock (16MHz crystal)

Or 16.777216s if you meant a 4MHz crystal (1MHz internal clock)

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