How much you earn per day online?

My main earnings come from professional writing gigs, which are paid monthly or upon completion, so it's hard to judge. However, I make at least $600 a month on average - more if there's a rush on - and this is part-time, just agency work. On top of that I add my other "dribs and drabs" like paid surveys and MyLot tasks, which equate to around $50. If you divide this by 20 (5 days a week) it rounds off to around $30 a day, although a "day" can be anything from 0 - 16 hours, depending on my workload and what's involved.