Yes, 2 days but the train was supposed to get to Asyut at 6:45 pm so I should have been able to catch the 8 pm bus but I would have stayed in Al Kharga (3 hrs from Asyut) and gone to Dakhla early yesterday morning.
If there are 2 or more it makes sense to hire a taxi from Luxor to Al Kharga for 300-400LE which would save tons of time. Being by myself I considered it but only briefly.
Contrary to the tourist office in Luxor, there was no 10 pm bus from Asyut to Dakhla which would have worked out well.
There is a 1 am train from Luxor to Asyut then you could catch the 11 am bus after puttering around Asyut for several hours with a police escort if you run into one as I did.
As for bikes, I think you could get one in the bus luggage compartment.