I signed 'Iss Pyaar Ko Kya Naam Doon' only for a year. But the producer requested me to stay on, as the show had just started to make money. I carried on, and in the process, the character became very popular. When I finally gave up, changing the actor for that character was difficult, so the show ended.
Whenever I don't have anything to do, I play Candy Crush or Scrabble. We actors have time between shots, which we need to kill. And we cannot call friends or family, as you are called at a moment's notice. So you need to do something which you can dispose of immediately when called for a shot.