So we re-filled the bird feeder this morning and about 2 hours later after a constant stream of birds it's almost empty again. To be fair most of the birds were very patient waiting on the fence or in the tree until it was there turn, that is except for the pair of nuthaches that basically just hustled and bolstered their way straight to the fron of the queue. Made for some nice pictures though so I guess I don't mind too much!