The following table shows best-case download times per 1MB.

Type of Connection

Maximum transfer rate

Time to download 1Mb File
(Ideal Conditions)

14k4 Dial-up Modem up to 1.6kb/s 12 Minutes
28k8 Dial-up Modem up to 3.2kb/s 6 Minutes
33k6 Dial-up Modem up to 3.7kb/s 4 Minutes
56k6 Dail-up Modem up to 4.1kb/s 3 Minutes
ISDN - 1 channel up to 8kb/s 2 Minutes
ISDN - 2 channels up to 16kb/s 1 Minutes
T1 up to 193kb/s 5 Seconds

source: Adobe