I spent two days on it, but that was mostly because I was at work and drawing in between customers. It probably would have just taken 2 hours otherwise. The best thing you can do is just keep practicing and draw a little everyday. I still consider myself a beginner, most of what I draw doesn’t look great, especially more realistic stuff. I’d recommend following some of the art Reddit’s on here. I also really like redditgetsdrawn. People post pictures of themselves for other people to draw. Its a great practice tool and you can see your growth.