It wasn't an intentional challenge. More of a curiosity to see how far/long I could go before it wouldn't shift, i.e. ran out of charge. The longest I've gone is 57hours, but that may be an outlier, in that three other charges went 47 hours. Of course, I recharged them when I still had 20% left. I also keep track of the number of shifts per charge and they range of 3866 to 4671. When I checked yesterday, I had two bars left, but I was also pretty high on the shifts.
I wasn't concerned as I started out on my 54 mile ride early this morning. The weather was ideal and I cruised along, feeling a bit loggy but otherwise fine. 20 miles in and I was coming to my planned nature break and refuel stop when the Garmin notified me that my power meter/pedals were low. I recall, perhaps incorrectly, that that meant 20% left. Since I recharge the DI2 and pedals at the same time, I became a bit concerned. One mile later Garmin gave me a notice about DI2, but I couldn't read the small print. I didn't really need to, I knew what it meant. So I evaluated the situation, being 21+ miles from home if I turned around, or continuing on. I turned around.
In an effort to conserve power to the DI2, I shifted to the small ring and kept my shifts at a minimum. This meant adjusting cadence and power. I may have shifted five times on the way back. (87 on the way up). The result was I didn't push hard and my HR never really got over-exerted. As it turned out, I lost the power meter about nine miles from home and the DI2 about two miles from home. Since I was in a comfortable gear, it didn't matter.
So, my curiosity had been satisfied. I think I'll go with 45 hours before recharging. And I'll continue to count the shifts to see if more data will narrow the gap. I'm pretty sure temperature plays a role, but I'm not that needy.
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