where do space shuttles go when they lift off? do they land earlier than scheduled without anyone noticing? or how long is sustained spaceflight?
They probably go to the upper levels of the atmosphere, out of sight, then go to a remote island.
So you are implying that there is some remote island in the middle of some ocean that contains an airstrip that can facilitate the landing of a space shuttle, and also the process of unloading it can be achieved. After that, the shuttle would obviously have to return to base (such as Kennedy Space centre in Florida). To facilitate that, the area would have to be even larger to promote another launch of the shuttle, and it may also have to be repaired due to some damage from flight and reentry. There would also have to be a very large amount of staff on said island to have them and possibly their families live there. Then finally, if somehow this amount of action is never noticed from any civilian or questioned, the shuttle would then take off again. It would then arrive at a base (such as Kennedy Space Centre) seemingly just having arrived from space.
How can you explain the actual video of the shuttle re-entering our atmosphere (along with video taken from space) and the damage that appears after it breaks through the atmosphere and has to endure the mass amount of heat? the whole idea that it can just simply land on a "remote island" is ridiculous, since it would have to be massive and be able to facilitate landing and takeoff of multiple shuttles (since there are more than one in space).