I dry it out of the sun. Usually in a room or in storage but I also use a fan otherwise the moisture will turn some of the leaves black. There is a ton of moisture in the leaves and so you have to be sure you don’t hang branches too close together. You also can’t easily dry them flat because the side that is laying has a tendency to turn black. It’s all a little tricky.
I don’t mind the curling part as happens with drying. I don’t know if the black leaves are good or bad. I just never have used it or sold any that do that. The bark will end up turning very dark, and that’s perfectly fine.
You can put them in the oven, but the problem with that is that the outside can quickly become dry and too brittle. Then the inside still has moisture that can then in turn cause the leaves to go brown.
It takes a long time for them to dry….well, it takes me a long time to dry them because I usually have 500 branches that are being dried in one place – takes about 10 days. But I would say, it would take a few days at the least for yours to be fully dry.
Hope that helps.