New NVR setup help

nites07

n3wb
Jan 2, 2019
11
3
Canada
I have a NVR4108HS-8P-4KS2 and a IPC-T2231T-ZS.

Ive been told the maximum HDD the NVR can take is up to 8TB. How much space do I really need to record 4 cameras at 1080p @25-30fps? I think 3 weeks of recorded footage would be enough.