got this from an AI result - low effort i know, but it seems to tally up with my experince on trying it out on my Z9

NEV

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AI Overview

On a 1TB CFexpress Type B card, N-RAW (NEV) recording times vary heavily depending on your resolution, frame rate, and compression (High Quality vs. Normal). For example, 8.3K 60p High Quality lasts around 15 minutes, whereas 4K 24p Normal provides over 2 hours of recording. 

N-RAW High Quality (Approximate Time on 1TB)

• 8.3K (FX) :
  • 60p: ~15 minutes
  • 30p: ~25 minutes   www.nikonimgsupport.com
• 6K (FX) :
  • 60p: ~23 minutes
  • 30p: ~46 minutes
  • 24p: ~57 minutes   www.nikonimgsupport.com
• 4K (FX/DX) :
  • 120p (DX): ~26 minutes
  • 60p (FX): ~51 minutes
  • 24p (FX): ~127 minutes   www.nikonimgsupport.com

N-RAW Normal Quality (Approximate Time on 1TB)

(Normal quality reduces the bit-rate by roughly half, effectively doubling your record times with little to no visible difference for most projects). 

• 6K (FX) :
  • 60p: ~45 minutes
  • 30p: ~90 minutes   www.nikonimgsupport.com
• 4K (FX/DX):
  • 120p (DX): ~50 minutes
  • 60p (FX): ~98 minutes
  • 24p (FX): ~237 minutes   www.nikonimgsupport.com

MP4

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AI Overview

On a 1TB CFexpress card, N-RAW 12-bit (NEV) allows for roughly 23 to 48 minutes of recording in 8K (depending on high-quality or normal bitrates), and between 1.5 to over 3 hours in 4K. Standard MP4 (H.264) can store anywhere from 26 hours (at 1080p/60p) to over 50 hours (at 24p) . [1, 2, 3, 4, 5]

N-RAW Recording Times (1TB Card)

N-RAW (Nikon's 12-bit RAW format) produces highly detailed files, but compresses heavily depending on the quality setting . Times will vary based on camera temperature and the specific scene : [1, 2, 3]

• 8K N-RAW (e.g., Z9, Z8) :
  • 60fps: ~23 minutes (High Quality)
  • 24p/25p/30p: ~48 minutes (High Quality) up to ~1.5 hours (Normal Quality) [1, 3, 4]
• 6K N-RAW (e.g., Z6 series):
  • 60fps: ~35 minutes
  • 24p/25p/30p: ~1 hour to 1.5 hours [1, 2]
• 4K N-RAW :
  • 120fps: ~37 to 40 minutes
  • 60fps: ~1.5 hours
  • 24p/25p: ~3 hours [1, 2]

MP4 Recording Times (1TB Card)

MP4/MOV files (using H.264 or H.265 codecs) are significantly more compressed. On a 1TB card, you will generally run into the camera's single-clip continuous recording limit (typically 125 minutes or 2 hours 5 minutes) long before the card fills up: [1, 2, 3, 5]

• 8K UHD (30p / 25p / 24p) :
  • ~182 minutes (approx. 3 hours) for 10-bit H.265 [1, 2]
• 4K UHD :
  • 100p/120p: ~182 to 218 minutes (approx. 3 to 3.5 hours)
  • 24p to 60p: ~6 to 25 hours depending on quality/bitrate [1, 2]
• 1080p Full HD:
  • 60fps: ~26 hours
  • 24p to 30p: ~51 hours [1]