Is it possible to report on Task Duration in minutes/hours rather than by start and due date?

Is it possible to report on Task Duration in minutes/hours rather than by start and due date?

I'm currently evaluating the free version of CRM and I like lots of things about it, it will definitely help my business with sales automation and I will upgrade to a paid version once the evaluation is finished.

However, I also want to use CRM for existing clients (accounts) where I can track how much time is being spent on tasks for these clients.  I can see clearly that both calls and events for each account have time tracking in minutes / hours but tasks do not have this.

Is it possible in one of the paid versions to measure task duration in minutes / hours and show this against specific accounts by user, this would really help me to see how much time we spend on each account each month and ensure that my billing is correct.

I really hope the answer is yes...

Thanks, James