Afaria Database Size Calculation

I am setting up an Afaria Environment in our company. I need to estimate the database size.

I know the following factors need to be considered to estimate database size.

1. Number of sessions per day

2. Average session size

# session per day * average session size = estimated growth

Could someone help me on how to get the Number of sessions per day and Average session size? Are these values available on Afaria Admin Console? or do I need to find it somewhere else?

Thanks in Advance.