Look at the movement graph above
You will lose reception when the satellite is at the northern end of its elliptical travel .
Those are hour markers on the ellipse. You can see it is at the north "end" for 3-4 hours each day.
The hour markers locations are at Greenwich Mean Time GMT so you can calculate the exact hours you would expect decay in your time zone using the GMT offset for your area.
Thanks for all this info...
Are the data points on the graph UTC or Mountain time? The plot ends at 1149 but the chart says it was updated at 1749 UTC Tuesday. I lost reception of CBC Toronto about 10pm Eastern on Tuesday evening, (0200 UTC Wednesday) and it had not yet returned a few hours later. If the datapoints are Mountain time, that would appear to be closer to the middle of the loop, not the end. If they are UTC, that shows me losing signal at the north "end" exactly as you suggest.
My dish is not securely mounted (why bother at this point?) and is probably a bit misaligned, which could cause me to lose signal somewhere else on the loop besides the north "end." Given the small time shift noted on the overlapping segment of the graph, I should be able to extrapolate where the sat is in its loop -- at least for the next few days. If I try to re-aim, should I do so when the sat is the middle of the loop, as opposed to either end?