Your theoretical maximum throughput at 1Mb/s would be
- 60 Mb/min, or 7.5 MB/min; (remember 8 bits in a byte)
- 3600 Mb/hour, or 450 MB/hour
Note that this is highly theoretical and does not include things like
- ethernet, IP, or TCP headers and checksums;
- non-data carrying packets such as SYN, ACK, various ICMP packets
- any allowance for non-duplexed data (ie if you have 1Mb/s total, then every request IN means you can't be sending OUT that instant)
- any allowance for local compute calculations that take longer to do than to transmit (ie generating a custom image, DB lookups, whatever)
So in this highly oversimplified case, if you figure peak demand for this web server is less than those values, you are good to go.