if you reduce your stave to near bow dimensions, and choose your drying area wisely. you can shorten dry times. a constant thickness stave will give you less troubles than one that is thick and thin. So if you rough out your bow with 3/4 limbs, but leave a 2" thick area in the middle for a handle. the handle will check. one way around this is to cut the stave down to 1" for the entire length and plan to glue up an extra piece to the handle. Attics are dryer than the humidity outside because the humidity is relative to the temperature and the attic is hotter. speed drying wood needs to be checked every day, especially the first week or so, so a car parked in the sun is more practical. get a digital gram scale to monitor weight loss. the first few days will drop weight fast as free water is lost, but the checking will happen later as the stave starts to shrink.