Planning a Triple Distro Setup: Need Partition and Usage Advice

I'm setting up a 2TB NVMe drive and currently have two Linux distros installed: EndeavorOS and Ubuntu (just upgraded from version 25.04 to 25.10). I'm considering adding Fedora, but I need to create another partition since I have over 900GB unallocated space left. I initially reserved about 465GB for the third distro, planning around 500GB, which should leave me with about 500GB of unallocated space afterward. Is that enough for an NVMe drive?

My goal is to experiment with three distros because I'm still figuring out which one I want to focus on. I've been using Windows but I want to switch to Linux more often, while also handling other IT tasks. I thought about using VirtualBox, but I had some setup issues in the past, and now I'm considering VMWare or containers. However, partitioning and installing the OS directly seems more straightforward to me. I also know someone interested in trying Linux, so I want to keep a GNOME-based distro for ease of help, even though I prefer other desktop environments. Eventually, I'm leaning towards installing Kubuntu as a more flexible option due to the advantages of KDE. I enjoy using EndeavorOS with KDE but have faced some maintenance issues. Given all this, would it be worth installing Fedora, or should I just stick with my two current distros?