How long does it take to send out my campaign?

Here is a rough guideline on how long it takes to send out a campaign once it has been approved.

List Size - Time to send (approx)...

100,000 - 16hrs
50,000 - 8hrs
25,000 - 4hrs
20,000 -  3.2 hrs
15,000 -  2.4 hrs
10,000 -  1.6hrs
5,000 -  45 mins
1,000 - 15mins