No worries.
The drying time all depends on the size and character of the root. Some smaller roots might be dry in two weeks...others might take a month or more.
As you are drying them, they seem to go through stages. First, they begin to soften just a little when you squeeze them lightly. Then they soften a lot. Next, they start to get firm. Finally they get very hard and you can't dent them with a finger/thumb. At that point, give them about another few days and you should be good.