Basic formula
Download time = file size in megabits ÷ internet speed in Mbps.
Convert file size
1 byte = 8 bits. A 1 GB file is about 8000 megabits.
Example
A 5 GB file on a 100 Mbps connection takes about 400 seconds before overhead.
Why real time differs
Wi‑Fi quality, server speed, network load and background apps can slow the download.
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