I've started my mission to LSO. May I post it or should it remain confidential for now. Horus knows what I am sending in terms of payload anyway.
The reason behind this is because even with ion engines this takes a crazy time (at least several hours), and at some point we both have a life... The problem is that if we add more ion engines to reduce the burn time, we also increase the dry mass and then we have to reduce the payload or add more fuel (which tends to increase the burn time again for the later). But at some point it's just a contest of who will be the most patient: the ideal combination is having a single ion engine to maximize the payload, but who will accept to spend more than 100 hours to complete this challenge?
To avoid pushing that contest to unreasonable levels I've already announced my performance (and I will already need 6 hours of burn time!).