@Sunny , the target DL has units of seconds. If you're pool mining the pool will override the value. Like burst.ninja is 86400 or 24hrs. If you solo mine you want to lower that to about 14400, or 4hrs. There is no need to clog the network with DLs longer than that, but 4 hours will let you see that once in a while your miner is submitting DLs.