I started putting my art online when I was like 13 even though it wasn't all that good XD so it took me... maybe 5 years to deem it worthy?
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I've been drawing since I was a kid, but drawing comics started in 2008 or 9, so 6(7) years so far. I got better, whether or not I'm 'decent' is always up to other people.
Still not comfortable sharing a comic just yet but I'm feeling like my art is at least decent nowadays. It took about 10-11 years for me to be able to look at a piece of art I created and say "Hey, I actually think that's good..."
I have plans to make my comic real in the near future :)...
I think if I look back on the things I've created, I can only go back 2-3 years feeling in some way comfortable with my work. Any further than that and it all looks terrible to me. I've been uploading art online longer than that, but the earlier stuff wasn't even close to decent.
I've been drawing for as long as I could remember, but I've always been forward about my art? There really wasnt even a point where I was like "yeah my arts good to show the world" I mean for heavens sake I used to upload art like this4 (yes this is my own old art)
I've never really been ''harassed'' because my art was objectively Bad back then which may be why I wasn't shy to show my awful art, nowadays I'm iffy sharing my art despite the fact it's good. It's more of the matter of when I thought my art was good enough to have commissions, but even then I was offering junk like this1 for money.
ignorance is bliss
but to stay on topic, majority of my improvement happened within 2012 - 2014
I have drawn ever since I could hold a pencil. However, looking back I feel wasn't at a decent level until 2011. The anatomy was getting better and I was started to develop a style.
While I can say I've improved, there are many areas in comic making that I struggle at still.
Its decent enough to show, but still forever a W.I.P.
I kind of did the same thing for my series...
It was pretty rough for the first few months (mostly due to a lack of a program that wasn't on a trial basis*) But I think here is where it finally settled down2 (as far as style goes) to something consistent.
*and that I had zero clue what I was doing....
I mean, I can look back at art from 3 or 4 years ago and think "wow, yikes, I can't even look at this," but honestly I think that will be true forever.
But the first time I can remember drawing something and feeling really happy with it, like it looked the way I really wanted to, was in middle school, probably around 8th grade (it was a cougar furry). That means I was drawing for about 12-13 years before I hit a moment of feeling like my art was coming out the way I wanted.
(I think that was before I really had a venue to post online, though, so sharing my art with "the world" in that way sort of came later. xD )
I was curious on this topic because of the title (LOL).
Anyway, It was late 2014 when I was able to build enough confidence to show my drawing to the world. I know my style is not at it's peak yet and I have tons of stuffs to learn but I'm pretty confident now on what I can do and will be able to do in the future. Plus there are people who appreciate my art so that makes me happy. 
It's hard to measure the exact moment of "when you were decent". I think for me, it's more of accepting imperfection in my work rather than realizing "I was good enough". I think it's right for you to start a comic when you weren't good at drawing yet- it's good to start early and get comfortable with showing your work early =)
how long until i was decent? you'd have to ask my neighbors...
now that i've gotten that out of the way, i would say "i was finally somewhat satisfied with my artistic skills about a year AFTER i finished drawing my first graphic novel2. which i am still coloring. So it took about 90% of my life.
I can't really put an exact date on it - I've been drawing since I was old enough to hold a pen.
I was objectively fairly decent by the time I was in high school, but when I compare the stuff I drew then to the stuff I draw now, there's a world of difference.
Of course, even after drawing for 25+ years, I STILL spend most of my time convinced I have no idea what I'm doing and that I should probably give up and get a job as a garbage truck driver. But then I remember I don't have a driver's license, and pick the pen back up.
It mostly came down to seeing other webcomics that started off with art that wasn't that amazing, so I thought it would be cool to just start and improve as I go along. It has worked to some degree.
Yep, I'm the same. Everyone always knew what to get me when I was a kid. Just buy him a how to draw book. I couldn't get enough of them, so I've literally been at this since I was a toddler, and I never really stopped.
And even then, I've never sat down to a drawing or piece of art without thinking, "okay, how the hell am I going to draw this part, or that part..."
But that's what makes drawing and making art exciting, it's knowing that no matter how good you get, you can always get better.