@Kenneth House
Why the curious 25 hour limit? A 2.6 amp contactor coil current would use up the entire pack capacity in 25 hours (2.6 x 25 = 65 Amp-hrs), in which case the contactor would return to it's normally closed position and a large potential would be applied across the depleted cells with a huge charging current exceeding 1C.
Perhaps we need to look more closely at how the contactor is being controlled via BMU/Charger interaction. I note your neat deduction of the contactor coil current, but suspect there is some "smoke and mirrors" involved in its operation. Could well be that the contactor physically latches in the open position and a low current control circuit trips the latch when it is required to return to the NC position. The BMU detects the Charger over voltage condition and either opens the contactor or prevents it from closing.
If the above is the case when applying the over-voltage test, then you are correct, the only condition fulfilled in such a test was the ability of the Charger/BMU to prevent an over-voltage charging condition, effectively indefinitely. To apply 36V to the battery without any BMU involvement would IMHO certainly result in thermal runaway.