depends on the humidity level of your basement -

a wet something in a wet room won't ever dry, like leaving a sponge in a plastic bag.

I would put a dehumidifier down there for a few days, and see if that helps -

I would also call the contractor, and ask THEM, since if they know what they're doing, they will either have an answer, or want to take a look at it.

It will take quite some time for the old bricks to dry out . Many of the older bricks can be quite porous and will absorb a lot of water ,you definately want to get some air circulation in there. As they do dry out you will probably notice a white furry substance come out of them. This is an efflorecence, my dad, who is an 86 yr old mason (only recently retired btw )also, calls it "Salt Peter".