Almost all 32bit plugins work fine in Nuendo 64bit. Exceptions are rare, and I’m yet to find anything that wouldn’t work with jBridge, at least in a separate GUI.
The ideal way of installation would be to have 4 folders for the VST2.x plugins:
- 64bit (I recommend to use the default folder inside the Nuendo directory)
- 32bit working (this contains plugins that VSTBridge can handle)
- 32bit jBridge (this is the installation directory for non compatible plugins)
- jBridge reference folder (as the name indicates, here are the references stored that jB creates)
With this setup, you can have 32bit and 64bit hosts running in parallel without any mess. If you don’t plan to do so, you could merge the first two folders, but then you should make sure that all installers allow to choose between 32bit and 64bit, and only install the latter.
Regarding UAD, I would recommend to use them with jBridge. Otherwise, the ASIO meter and CPU load under Nuendo will increase with every plugin that you load to run on the UAD card.
I’d say that two hours sounds slightly too fast, but even with a huge amount of plugins, it shouldn’t take longer than half a day. It has been very different one or two years ago, but things have greatly improved since then.