I don't think so. A shallow experience in C (less than 10/15 years of experience) will not add much to your career. It is very difficult to get a job where understanding how systems work at low level will be needed nowadays that most of the resources are spent on a few layers above.
That's a very bad answer imo, knowledge is invaluable, even if you work on higher level stuff knowing the low level workings will give you an advantaged over many team mates