There seems to be a lot of differance of opinions, i take from the replys that there is not any real set time only that they should be wanting to fly. The reason i asked is that my birds are only flying for about 20/30 mins and than want to get back in the loft,though today they seemed to be a lot happier, the weather has improved and with that there flying time, hopefully this will be a turning point for them and i will hopefully have some good races with them in the future, many thanks for all the replys to the question.