That's up to you. If you are going to be hands on, opening for any reason, I would add a wet sponge or cloth and push it up past 65% if possible. I shoot for at least 70% and use sponges in my bator.
If you are going to be hands off, leaving the incubator shut for hatch 60% can provide enough humidity. Yay! For pippers, congrats and good luck!
Depends on your bator too... but I keep a shotglass with sponges cut up in it with distilled water inside. I also keep a 2 inch funnel with aquarium tubing. If I need to open, I put that through my air vent and can quickly drop additional water into the bator. My basic start is wells filled with paper towels laid across to wick.