I've been having a look at a website suggested to me called www.monero-miner.com - I'm not sure how legit it is, basically it claims to be able to mine inside the browser and deposit the coins you earn into your wallet.
Scrolling down, as part of the blurb, it states "Payments are done automatically to your wallet once you reach the minimum withdrawal amount".
Is there a standard minimum withdrawal amount? Or can this vary from service to service? Because the website doesn't seem to state it.