Limited Access with Basic Plan?

Hello.  New user here - never used this kind of virtual set-up.  I have the basic plan when I signed up but unless I read wrong, I understand that there is a 40 min max from 1 to 100 users?  My employers tech company will be hosting a couple of training days that will last about 6 hours each.  Anyway, I have been sent an email my my boss to launch the link for the training along with the link to download the app, which I did on my phone and laptop.  So with that, I have created an account.  Do I have to pay to upgrade to unlock some unlimited access?  40 min seems pretty useless for my situation.