How long will The Big Bang Theory last? Star Kunal Nayyar says the popular CBS sitcom could continue for several more seasons, Metro UK reports.

The series is currently in the middle of its ninth season.

When asked when the show will end, Nayyar said he thinks The Big Bang Theory still has plenty of life left in it:

We have one more series in our contract, that’s Season 10. Other than that I don’t know. But I’ll keep doing it for as long as they will have me. … We could all have walking sticks doing The Big Bang Theory Season 20. I think realistically there’s less time left now than there was on the show before. Maybe it will go to 11, 12 or 13. I will do it as long as I can. But I think it is somewhere in that range.”

So far, season nine of the sitcom is still earning big ratings, with an average of 3.83 in the 18-49 demo and 15.443 million viewers. And last year, series co-creator Chuck Lorre said the series will continue “as long as everybody is having a good time and we’re making a show we’re proud of.”

What do you think? Do you watch The Big Bang Theory? When do you think it should end? Has the show already run its course?