The Thunderbolt 3 standard has been available for roughly four years now, but cable lengths have so far generally been limited to a couple of meters
Thunderbolt (interface) - Wikipedia
Corning's Optical Thunderbolt 3 Cables Now Available in Lengths From 5 to 50 Meters - MacRumors
Corning's Optical Thunderbolt 3 Cables Now Available in Lengths From 5 to 50 Meters - MacRumors
40 Gbps Thunderbolt 3 Flippable and reversible connectors Daisy chain multiple Thunderbolt devices All-dielectric cable provides enhanced galvanic
Optical Cables by Corning Thunderbolt 3 USB Type-C Male Optical Cable, 50m
Thunderbolt (interface) - Wikipedia
Thunderbolt™ Optical Cables, OEM Optical Communication Solutions
Sonnet Introduces Thunderbolt 4 Dock With Up to 90W Charging for Macs, Page 2
Optical Cables by Corning Thunderbolt 3 USB Type-C Male Optical Cable, 5m : Electronics
Thunderbolt Optical Cable by Corning 60m
Apple's $130 Thunderbolt 4 cable could be worth it, as seen in X-ray CT scans
Review: Corning's 33-foot Optical Thunderbolt cable allows you to move your Thunderbolt devices (or Mac) far away from your desk - 9to5Mac
PSA: For Thunderbolt 3 over distance; use *OPTICAL Thunderbolt 1/2 cables!*, Page 2
Optical Thunderbolt 3 Cables Begin Rolling Out in Lengths Up to 50 Meters, Page 4