# What is turn-around time of accelerator?

I was looking today through pdg table of collider parameters and I saw that some turn-around time for LHC is $\approx 200$ min. I tried to search on it, but everywhere it is kind of assumed that you already know what it is. In pdg review on accelerator physics, it was barely mentioned in Tevatron description

The route to high integrated luminosity in the Tevatron was governed by the antiproton production rate, the turn-around time to produce another store, and the resulting optimization of store time

Could anyone explain to me what does this turn-around time means?