Maybe an hour?
Sometimes there are only so many locations or positional movements within a room that it doesn't take long.
Even then, i can't say anything is perfect.

I agree with bridgman though that the M60s were easier to place than the M22s but distance was a factor. The farther away from the sitting location, the less that speaker placement had much of a role.

"Those who preach the myths of audio are ignorant of truth."