That's insignificant, Alan! You and I spent a lot of time solving this problem not knowing that there's a shortcut...
here's that shortcut:
12 hours / 11 =1.0909090909090909 = 1h, 5min & 27.272727sec
or
720min / 11 =65.4545454545454545 = 1h, 5min & ~27sec
or
360o / 11 =32.727272727272727o (converted into time units) = 1h, 5min, 27sec
Basically, 1h/5min/27sec is an interval ( as your yesterday's graph shows) that repeats 11 times.
Once again, you did a good job!