Regardless of your plan, your Repl will have 0.5vCPU and 0.5GB of Ram. When in the workspace, your Repl will have two gigs of both for an improved development experience and after you leave, the resources will be brought back to 0.5 gigs of each.
Hacker plan users are allowed one boosted Repl and one always-on Repl.
I got it now, I was forgetting the case when a replit is called by a user, and will start automatically at that moment (on that case the boost might be helpful) Thanks!