I would say 10k is enough that you can put it on your resume... But, even that is probably way less than the average comp-sci graduate writes. So, I would still consider it a starting point. Especially, since reading other peoples code is just as important a skill, and that isn't something generally picked up in school, or on little weekend projects using a new language.
But again, it depends on the breadth of the problems being solved. We hired a web developer a couple years ago, who in the space of about a year wrote ~150k lines of PHP and javascript, and got a _LOT_ better at it, but he solved most of the problems the same way and there was a metric ton of duplicate code, and imprecise problem solving (AKA problems solved in the most roundabout way). Over the last 2 years I've probably only written about 50k lines of PHP/Javascript but I've added about 20x the functionality he added. So, I would say that i'm better now than he was when he left, but i'm still not really that good.