Update:
To recap, I pitched at 68 degrees.
At 7 hours, blow off at 2 bubbles / sec and temp = 75 degrees
At 24 hours, same blow off pace, 82 degrees.
At 48 hours, same blow off pace, 82 degrees.
Last night at 60 hours, the blow off had slowed to about 1 bubble / sec, So I decided it was time...