I have no experience with jumping making you lose time, that was something I read on these forums.
nitsuja makes a good point though. As far as I know the pattern remains the same for jumping or running, but I only tested it by running a certain number of frames, then jumping, taking that distance and then comparing with just running the whole way. It could be that jumping has an effect on distance traveled after the jump, and maybe it takes a frame to land? As a hunch, I don't think this is the case but I will test that out.
Wait, not so much a hunch, because I let both come to a halt, and they both slowed down in the same way, so I don't think a frame is lost, nor the pattern reset.
I'll test it anyway, however.
Edit: I think they were the same because I messed my save states up, jumping definitely has an impact on distance traveled.
Edit x2:
Ok, during a full jump, here is the forward movement:
1,1,2,1,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2,1,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2,1,1,1,2,1,1
The repeated frames are 1,1,1,2,1,1,2,1,1,2,1,1,2,1,1,2 Average 1.3125
Contrasting running 1,1,2,1,1,2,1,2 Average 1.375
Sorry for the confusion!
