Smart Classes are not very valuable unless you have discovered most of the content on your own, which would normally happen if you have implemented a lot or have spent a lot of time examining the source code.

Based on feedback that simply "unlocking" the course does not lead to a valuable outcome for the Partner, we pair these classes with coaching and consulting services - see https://www.odoo.com/page/partner-success-packs

The amount of hours you will need to consume of these services depends on:

• the amount (length of time) of experience you have with Odoo
• number of implementations you have been successful at
• participant learning style
• participant skills with associated content (ie: Accounting, Manufacturing, Web Development)
• amount of work (length of time) each participant is prepared to invest in the class 

You should become a Learning Partner only if you are also prepared to purchase the additional services for the class(es) you wish to take.

I have been using Odoo for 11 years and found both the Accounting and Inventory classes to provide value to me when taken in a live format.