As Monero increases in price, more and more miners are jumping on board especially with the fact that Monero can be mined with a CPU and enhanced with PeerHash.
The minimum withdrawal for Dwarf is 0.1 XMR so if you’re mining XMR and using PeerHash you can reach that in a reasonable time. Of course the longer you wait the less impact the fees will be however you should check back regularly on their site to see when the right time is to withdraw.
It may be prudent to withdraw on a regular basis somewhere in the range of 0.1 to 0.5 to ensure you’re realizing your profit and pay for your hardware and/or electricity expenses. Happy mining.