I understand if the muse is there and the artist has got some free time to do a request during a stream or what have, and it gets done within a few days or so.
I also get it if you never really get the free art after a while or so, I mean it's free and I'm sure that real life and other shenanigans get in the way and take the attention away from the request or something
I'm a really laid back person but I feel like all artists have a certain reaction to their characters being drawn and that it's along the lines of EEEEEEEEOHMYGOSHYOURDREWMYCHARRIES!!!!
I'd be patient with it, considering it is free and the deviant decided to take time to make anything at all. X3 Of course I have loads of free time so I just do loads of free work in small periods of time. :/
If its free I can wait forever although sometimes you can get forgotten so its like eh its not like I paid for it although it would have been nice. I guess since you didn't have to do anything for it you really shouldn't push it at least for me ^^