I have a small humidor with about 30-40 cigars, and probably only smoke one a year. Some of the cigars in there are over 5 years old and are in great condition. A couple times a year some friends have poker games and I'll bring a handful to pass out, or for a wedding party or what have you. I get them from Cuba so they're cheap to buy and can keep for a long time.
I use the Cigar Oasis Ultra, although last year the electric ribbon broke, and now I'm using humidity beads, and they work fine. One day I'll try to fix my Cigar Oasis.
Once a month I open the lid, make sure no mold is developing, and check and sometimes replenish the beads. With the Cigar Oasis you could go longer.
Make sure you use distilled water.
http://www.cigaroasis.com/Products/humidifiers.html
https://www.amazon.ca/Cigar-Humidor-.../dp/B000H6813K