I don't want to have to figure this out again, so here is the "exact" length of one horizontal line in microseconds. If you want seconds, remove the 1,000,000 number.
H = (1001 * 1000000 * 2) / (1000 * 60 * 525)
(this can be simplified down to 4004/63)
The "exact" length of one field (ie space between start of two adjacent vsync pulses) in microseconds is:
V = (1001 * 1000000) / (1000 * 60)
(simplified down to 50050/3)
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