How long does it take to copy 50 GB over WiFi 5? Real-world signal interference

A 50 GB transfer over WiFi 5 works out to 16 minutes 40 seconds at a realistic 400 Mbps sustained rate on a good 5 GHz 80 MHz link. 802.11ac's marketing number of 1.3 Gbps assumes perfect conditions. In a typical home with walls, interference, and a few meters of distance, 400-500 Mbps is what you actually get.

Transfer time

16m 40s

At peak link speed

File size

50 GB

Link speed

400 Mbps

WiFi 5 (real-world 400 Mbps)

Configuration

File Size

Connection Speed

Mbps

Estimated Transfer Time

16m 40s

Speed Comparison

USB 2.0

13m 53s

480 Mbps

USB 4 / Thunderbolt 4

10s

40 Gbps

Gigabit Ethernet

6m 40s

1 Gbps

10 Gigabit Ethernet

40s

10 Gbps

WiFi 5 (ac)

16m 40s

400 Mbps

WiFi 7 (be)

1m 20s

5 Gbps

SATA SSD

1m 30s

4.4 Gbps

NVMe Gen4 SSD

56 Gbps

How this is calculated

Close to the router on a clean channel, WiFi 5 can push 600-800 Mbps briefly. Through a wall or at range, 200 Mbps is more realistic, doubling the transfer time to ~34 minutes. That's why large transfers over WiFi feel inconsistent. The link rate changes moment to moment. If consistency matters, wired Gigabit at ~110 MB/s sustained is a cleaner choice for large transfers even in a WiFi-first home.

Verdict

16m 40s is a reasonable WiFi 5 estimate at good signal. In practice, vary it by 1.5-2× depending on range and congestion. For a predictable transfer time, plug in.