>takes artists on the net 3 days to pump out a great rendering

Speed comes with experience. Don't worry about it and keep working.

No one really cares about how long you take unless you're doing commissions and take months to communicate with your client.
I'm sure you're not in that stage yet so there's nothing to worry or be jealous about.

Side note, a lot of artists lie about the time a drawing took them. Some would label a finished looking piece as a "quick doodle". Don't think about it too much.

>>3123828
>a lot of artists lie about the time a drawing took them
>tfw guilty of this