My Sims only play a social game for a couple of seconds, too. To me, that's just how long it lasts in Sim time.
@Fez:
I know you've probably already heard this, but when you set your Sim to listen to a tabcast, he/she will have a moodlet telling what he/she is listening to and how much longer it will last. As soon as the next level is reached, the tabcast automatically stops. And there are some things they cannot do at the same time. For example, mine can meditate while listening to a tab cast, but cannot break boards. So, it also depends on the activities involved at the moment.