Who suggested checking in with juniors every 30-60 minutes? GP certainly didn't. You're arguing against a strawman.
And very importantly, I'm saying 30-60 minute remote check-ins are an absolutely insane idea that should never be implemented.
I don't know any kind of remote system that provides for anything even close to the power of in-person mentoring.
How about letting them figure it out and provide opportunities to chat and ask questions from time to time. Everyone wants superdevelopers but everyone expects that you're going to put a complete noob in a room with a senior developer, they're gonna rub hand and in 2-4 days you're going to have another senior developer. That's not how it works.