How Long Does It Take to Download 100 GB at 100 Mbps?
Downloading 100 GB at 100 Mbps takes about 2 hours 23 minutes under ideal conditions — expect roughly 2 hours 58 minutes to 4 hours 46 minutes in practice.
Why the real-world time is longer
A 100 GB file contains about 859 gigabits of data. At the full 100 Mbps line rate that transfers in 2 hours 23 minutes. Real download speeds, however, usually reach only 50–80% of the advertised rate because of protocol overhead, Wi-Fi conditions, network congestion, and limits on the other end of the connection — which is why a realistic estimate for this transfer is 2 hours 58 minutes to 4 hours 46 minutes. Press Calculate above to test your own numbers.