Tech
Data Transfer Time Calculator (Fiber vs Satellite vs 5G)
How long a file transfer takes at any connection speed.
In this article
Advertised vs real-world speeds
A "300 Mbps" connection delivers 300 megabits/second in ideal conditions. Real-world throughput with protocol overhead, congestion, and hardware limits is typically 70–90% of advertised speed. A 25GB file on "1 Gbps" fiber takes ~3.4 minutes; on 25 Mbps DSL: 2.4 hours.
Frequently asked questions
How long does it take to transfer 1TB over fiber?▾
On 1 Gbps fiber (effective ~980 Mbps): ~2.3 hours. On 100 Mbps cable: ~22 hours. On 25 Mbps DSL: 3.6 days.
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