Harmed by running out of feeder nector
We live in the foothills not far from Tahoe and over the past few years we have had more and more hummers stay around our house and so we continue to add more feeders for the new ones. Now we have 7 feeders and 25 or more hummingbirds, which crowd each other when they're feeding. There are times when the 4 holes in all 7 feeders are taken at the same time! They typically drink everything in 2-3 days. My question is that I'm leaving for a long vacation and the feeders will by dry for 30 days or so. Will my birds be harmed when the feeders are suddenly empty. Should I slowly wean them off by using less and less sugar until I leave?