[RTTY] Calculating on-time/off-time

[knormoyle at comcast.net]

I just realized I don't understand on-time/off-time calcs.

from wpx rtty rules:

I. Period of Operation: Single Operator stations may operate
only 30 hours of the 48-hour contest period. Off time periods
must be a minimum of 60 minutes in length....

If you start 45 minutes after the contest started, does
that mean your on-time is as if you started at the beginning? 
i.e. is that considered off-time that is less than 60 minutes?

Same question on ending early.

Alternatively you could imagine calculating your on-times separated by 
minimum 60 minute off-time periods. 


thanks,
kevin