I've generated LUTS before with ColourSpace and it has typically taken a few minutes. It's always given a "Not Responding" warning briefly and the "Calculating" progress bar doesn't seem to be particularly responsive, but now it seems to be stalling. I recently updated my NVIdia driver to version 560.81 in order to install DaVinci Resolve 19 I'm pasting the information from the NVidea System info

NVIDIA System Information report created on: 09/08/2024 17:01:32
System name: MSI

[Display]
DirectX version: 12.0
GPU processor: NVIDIA GeForce RTX 2070 with Max-Q Design
Driver version: 560.81
Driver Type: DCH
Direct3D feature level: 12_1
CUDA Cores: 2304
Core clock: 1110 MHz
Memory data rate: 11.00 Gbps
Memory interface: 256-bit
Memory bandwidth: 352.06 GB/s
Total available graphics memory: 24482 MB
Dedicated video memory: 8192 MB GDDR6
System video memory: 0 MB
Shared system memory: 16290 MB
Video BIOS version: 90.06.58.40.2A
IRQ: Not used
Bus: PCI Express x16 Gen3
Device Id: 10DE 1F14 12B01462
Part Number: 4914 0031

[Components]

nvui.dll 8.17.15.6081 NVIDIA User Experience Driver Component
nvxdplcy.dll 8.17.15.6081 NVIDIA User Experience Driver Component
nvxdbat.dll 8.17.15.6081 NVIDIA User Experience Driver Component
nvxdapix.dll 8.17.15.6081 NVIDIA User Experience Driver Component
NVCPL.DLL 8.17.15.6081 NVIDIA User Experience Driver Component
nvCplUIR.dll 8.1.940.0 NVIDIA Control Panel
nvCplUI.exe 8.1.940.0 NVIDIA Control Panel
nvWSSR.dll 32.0.15.6081 NVIDIA Workstation Server
nvWSS.dll 32.0.15.6081 NVIDIA Workstation Server
nvViTvSR.dll 32.0.15.6081 NVIDIA Video Server
nvViTvS.dll 32.0.15.6081 NVIDIA Video Server
nvLicensingS.dll 6.14.15.6081 NVIDIA Licensing Server
nvDevToolSR.dll 32.0.15.6081 NVIDIA Licensing Server
nvDevToolS.dll 32.0.15.6081 NVIDIA 3D Settings Server
nvDispSR.dll 32.0.15.6081 NVIDIA Display Server
nvDispS.dll 32.0.15.6081 NVIDIA Display Server
PhysX 09.23.1019 NVIDIA PhysX
NVCUDA64.DLL 32.0.15.6081 NVIDIA CUDA 12.6.41 driver
nvGameSR.dll 32.0.15.6081 NVIDIA 3D Settings Server
nvGameS.dll 32.0.15.6081 NVIDIA 3D Settings Server

All LUT calculation is CPU.
So the issue will just be a defective profile that contains values that are invalid, causing extended LUT generation times.
If you wait, the a LUT will be generated, but that may take a long time for LTE/HTL license levels, as they are single thread.
The higher license levels are multi -threaded, so use all CPU cores available
Please post the profile so it can be assessed.

Steve