From time to time I see in these threads that one should return sometime other than at the beginnig of the return window. It is mentioned above that the wait may be longer if one does. The system is set up to issue a certain number of fastpasses before the return time moves forward 5 minutes. Every five minutes, say at Space Mt., 100 tickets become valid. There is no control when these 100 Guests return, however it evens out over the course of the day. The Cast Member working at merge point, where the standby and fastpass lines merge, has the task of keeping the fastpass return wait between 5 and 10 minutes implementing a variable ratio of 4/1. When the fatpass return line backs up, it is because: 1. The ride is experiencing operational or technical problems (ie. unusual number of ride stops due to slow moving Guests); 2. The Cast Member at merge point is not responding to the back up by adjusting the ratio; 3. The moon, stars, earth & sun are lined up in a way that has a whole bunch of fastpass riders showing up at the same time (the number of tickets distributed is reduced when pent up demand is antcipated such as at parade break); 5. When there is heavy demand in the fastpass return line, stanby Guests must still be allowed through so that line does not come to a complete stop. Therefore, it does not matter when one returns, as long as it is not early. Gate huggers waiting for their fastpasses to become valid are a cahallenge for all concerned.