One reason why I put the attack on Jenga on a place between Jupiter and the Main Belt was that I needed them out of range of help for a few hours. At the moment most Fen can cover nearly all travel in the solar system with their car within a day... most will be done within a few hours or less.
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Some more thoughts on numbers.
If 1g (or lets say 10 m/s^2 for simplicity) is a common acceleration in Fenspace, having a maximum speed of 0.1c doesn't make much sense. It would take more than a month to reach 0.1c from zero speed and you would be far out of the solar system (and in the Kuniper Belt) when you reach it.
At 10g you still need 3-4 days to reach 0.1c, and you will still cover ~ 4 lighthours until you reach it, which is nearly enough to get from the Sun to Pluto...
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Some more thoughts on numbers.
If 1g (or lets say 10 m/s^2 for simplicity) is a common acceleration in Fenspace, having a maximum speed of 0.1c doesn't make much sense. It would take more than a month to reach 0.1c from zero speed and you would be far out of the solar system (and in the Kuniper Belt) when you reach it.
At 10g you still need 3-4 days to reach 0.1c, and you will still cover ~ 4 lighthours until you reach it, which is nearly enough to get from the Sun to Pluto...