Event Timing

Does anyone know how timing 'units' relate to real world seconds? Like a unit is x seconds.

The only referance I've seen as to what a unit is, compares it to a "frame".

From a quick search, SNES runs at aprox 30 frames a second, average.

So, if all that is true a unit would be aprox 1/30 of a second?

Thanks I started with that value, but tuned it down to about a quarter of that actually. It's not *exactly* correct, but it's awfully close.