For 8ft long lumber, how many supports should one use when air drying?

I bought a dozen 2x12 x 8ft boards at the local big box store.
Geez talk about mediocre wood. Most were pretty damp and I am hoping
it was because they got rained on.

I "borrowed" the lath strips that got exposed as I picked through the
pile. I have eight strips that run almost the full width and laid
those down on the garage floor - a bit over a foot apart.

I'm thinking I will sacrifice some free yard sticks and add those to
the pile.

Thanks,

JJ