How Long Does It Take to Download 1 GB at 25 Mbps?
Downloading 1 GB at 25 Mbps takes about 5 minutes 44 seconds under ideal conditions — expect roughly 7 minutes 9 seconds to 11 minutes 27 seconds in practice.
Why the real-world time is longer
A 1 GB file contains about 8.6 gigabits of data. At the full 25 Mbps line rate that transfers in 5 minutes 44 seconds. 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 7 minutes 9 seconds to 11 minutes 27 seconds. Press Calculate above to test your own numbers.