As Pat said, dry time varies. Once the roughed out, floor tillered bow starts to feel light in the hand, you can test it by bracing it about 4" on your tillering tree (about 1" brace height for 3" of reflex). Dry wood will faithfully return to its original position, where green wood will start to follow the string. For flatbows, I've also roughed them out and floor tillered them. After drying, I work them down so they bend under the same amount of pressure. After a while the bow wil remain the same stiffness during floor tillering and will need no more reduction.