Buses & people

alright guys, for those complaining that their brains are slowing down, here's one quite complicated one.

"A bus begins its rounds daily at 6.30am & ends it's rounds promptly at 7.30pm.
Now, one day, on a normal weekday, this bus begins its round full of people. By the time it finishes its round however, the bus is emptied of its passengers. No more people are on the bus.

Now here's the catch: no single person got off the bus.
How is this possible?"

mind boggling huh. the answer's quite logical though. now get those brain juices flowing. will post the answer soon. watch out for it. LOL. feel free to tag any answers that u think is correct. Remember: the answer is LOGICAL, emphasis on the word logical, k.

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no, aliens did not abduct them.