Is it more labor intensive to install hickory over red oak?

Do you mean, nailing a hickory floor over the top of a red oak floor, or is hickory harder to install, then a red oak floor?
If you meant the latter, then no.

Hickory nails about the same as oak. Now ,finishing it! That is another bag of beans.

If the boards are the same size, there is no difference in labor to install one as opposed to the other. The cutting and nailing will be the same. Hickory/Pecan is harder but should not pose any problems except maybe more tongue split. Oak sands and finishes a little easier if the milling of both is equal. Hickory/Pecan is less stable.

Thanks for the replies. I meant installing new flooring in a new home from scratch--oak vs. hickory.
When they say hickory is low in stability, what does that mean? How will that effect installation?

I have been told that hickory will definitely NOT cost more to install than oak from a wood supplier who is very familiar with both. The installer we are actually using is telling me it will be significantly more expensive.

Stability in wood means the wood remains fairly constant in size and is not affected by RH compared with unstable wood. Basically, some woods move (expand and contract) more readily than other woods. BTW, ask your installer WHY it will cost more and see what he says. Maybe he will be taking more steps with the hickory than with the oak. I don't know what they could be but I'm curious as to his responce.