You may evaluate Promodag Reports for a period of up to 45 days from first installation. The only other limitation is that your reports on e-mail traffic or OWA and Active Sync activity can only cover a maximal period of 15 consecutive days.
You can indeed only import up to 15 consecutive days of Exchange message tracking files or IIS log files in evaluation mode, which explains the latter restriction.
There is no limitation to the number of report templates you can use - all options being available - during your 45-day evaluation period.