The 34-year-old actor has played Rajesh Koothrappali in the US sitcom since it began in 2007, with the show making him and his cast mates, who include Johnny Galecki, Jim Parsons, Kaley Cuoco and Simon Helberg, among the highest paid television actors in the world.
Kunal and his co-stars are contracted up until a tenth season and although he wants to portray Rajesh for as long as possible he believes that the show realistic only has few years left, reported Female First.
"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.