Where in airport do I get the 24 hour stamp?

In the majority of the airports the first thing you should do is to identify 24/144 hour visa free transit counter. Again, in the majority of the airports they are very wells signposted, so you will easily recognize one within minutes. However, a small number of airports have this formality done in the same place where the immigration is. In any case, if you do not recognize it soon, you should just ask or you should just head toward immigration.