Is there a word or phrase for the time taken to become productive?

I'm looking for a word of phrase that essentially means the interim between when something has begun and when it is productive. This would be "boot time" on a computer.

My specific example would be the time between the established start of a meeting -- 10 am for instance -- and the time when everyone is finally in the room, on the call, technology wrinkles (connectivity/audio/video) ironed out, etc...say 10:05 am.

"Ramping up" is a driving metaphor for getting up to speed, getting past the initial learning stages, with a task. It is good for a team or new employee. It isn't perfect for a meeting, but has some flavor that might be useful.

I’d call this period at the start of a meeting settling time or settling-in time.

This time is characterized by people entering the room, finding seats, positioning/connecting devices, arranging papers, etc. I would describe this as “getting settled in”.

After this intermission, you might hear someone say “OK, everyone settled? Let’s begin.”

I come from a technology field so perhaps this is somewhat specific to that but I have heard the period of time from when something starts until it is somehow useful of functioning described as the:

spin up time

I probably would not use this term in a serious report but in casual conversation I would be surprised if people didn't know what you meant in any context.

I would use the phrase Warmup Time. When working as a writer, this is the period when I check email, set up my working websites, bring up my editor, start a few words, go to another website, come back, change the words, then finally settle into a fugue state. It's a set of mental rituals and patterns that get my brain in gear, allow me to start blocking out distractions, and place a mental wall between myself and the rest of the world. Once I get into that fugue state, I'll occasionally do fugue waking, where my brain is active but my body is going to the bathroom or getting some food, but that's only after I've established fugue in the first place.