Don't put out feeders if you're not prepared to maintain them.
Hummingbirds are very small, with very small organs — even a small amount of bacteria can be harmful or deadly.
Many people fill their feeders with nectar and don't bother to change it or clean the feeder when the birds don't drink it all. In those cases, it would be better to let the hummingbirds find other food sources, either natural ones or from neighbors who have time to properly maintain their feeders. Neglected nectar becomes a health hazard quickly.
Hummingbird nectar turns cloudy with bacteria, and black mold or fungus can begin to form. One serious result is Candidiasis — the hummingbird's tongue swells until it can't retract, making it impossible to feed. The bird slowly starves to death. If you've ever seen a hummingbird sitting still at a feeder and looking weak, a dirty feeder may be why.
If you're not prepared to do this, don't put out hummingbird feeders.
I maintain five or six feeders and change the nectar every two to three days, scrubbing each one thoroughly with hot water and cleaning brushes before refilling. It takes a few minutes per feeder — and once it's part of your routine, it's not a big deal.
If you don't have many hummingbirds visiting yet, only put a small amount of nectar in each feeder so you're not wasting it every time you clean. Make a full batch, fill the feeders partway, and store the rest in the refrigerator. You'll waste less and still stay on schedule.