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I did the power reserve test on SD43 and took readings throughout the process:
full wind, dial up +0.5 SPD 284 amp
10 hours, -0.5 SPD 273 amp
34 hours, -1.6 SPD 250 amp
48 hours -2.5 SPD 227 amp
58 hours -7.3 SPD 193 amp
power reserve lasted 72.5 hours
Yes there is a 70 hour power reserve, but a mechanical watch isn't intended to be worn every few days. It performs optimally and consistently if worn every day.
Dual barrels would only improve the time keeping if a watch was sitting over at least 12 hours. The second barrel doesn’t start releasing until the first is almost unwound.
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