I do MM so I don't know if my reply will help. I MM to 12000 so I only do a one stage buff with Meguires. A typical buffing takes me about 20 seconds to do both blanks still on the mandrel.
I typically add a few drops of Meguires and a few drops of water to the buff each buffing session (each session, not each pen).
I add the water to soften the Meguires material still on the buff from previous sessions.