I've seen this situation several times. My decision is often based on the patient's individual "dental IQ". If they have made an effort to store the tooth in some kind of medium, I will often replant the tooth even if it's over an hour or 2. I make sure they understand that it probably won't work, but there's nothing wrong with giving it a try...you can drop it in the trash now, or you can drop it in the trash in a a couple of weeks...you're not losing anything to try.
On the other hand, I've had this situation where the kid is just sitting there and mom is rummaging through her purse looking for the tooth. And another dad who just told the kid to put it in his pocket until the baseball game was over. 6 hours later, I wondered what they expected me to do. Those people I basically told they were wasting their time unless they can get to a dentist within an hour of the injury.