Well it varies, but in short times.. for example, starting from on top of troll stronghold, I planted a herb seed at 5 pm. Then go around planting flower seeds, toadflax seeds, and a hop seeds. At the end, back at troll stronghold at around 8:50. At that point, I thought wait 15 minutes maybe it'll grow eariler. I check in, nope not finished. Check 10 min more, nope not ready. Check 10 min later again, nope not ready, check 5 min later, nope not ready, check 5 min more, nope not ready, grow already FFS.