I implore you: never stop learning because the moment you stop learning is the moment you become obsolete.
The web is unique in that none of us can predict exactly what we’ll be doing in 5 years time. What will web pages look like? What language will we be coding in and for which devices? To say you are a web professional isn’t to say that you’re a CSS or Ruby specialist- it’s to say you’re constantly committed to discovering and learning about what’s next.
There are days where each hour is blocked out as billable time for client work, but every day can’t be like that- especially for web professionals. As a boss, I know that learning through experimentation and exploration makes my employees more valuable. As a worker, I know that if I’m going to have a job in this industry next year I’d better learn something new.