Well, you don't have to do it nonstop, you can drive for a bit, stop, and go back to the space center and return later. (no quicksave)
But it is pretty cool to do it in one go if you have the time.
Yes, I'm all for that.
It doesn't have to be only solar powered.
But remember, your time starts as soon as you start a new game, so you have to strategically time placing your fueltanks.
* EDIT: It is the fastest option, I'm doing this solar and lose 2-4 hours a day waiting to recharge batteries, in that time it would be possible to drop fuel on multiple waypoints without losing time against solar drivers
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