A G is 35 km/h per second, i.e. under a 1 G acceleration you go from 0 to 35 km/h in a second, which means 96 seconds where gravity feels like it's at a 45 degree angle and 41% stronger in order to reverse directions.

Alternatively, if you target a 89° angle (1° off from normal) then it takes 90 minutes to reverse and is less than a percent stronger.

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