I often use 15 averages/spiral, so 75 in total for each speaker. Movement speed is something like 5 cm (2 inch) per second. Don’t know about clipping, I even have +7 dB on speaker setup after my room correction without ever getting any clipping. But I also use volume leveling which helps.
Lots of people spending lots of $ on minuscule improvements, while sitting in an untreated room without room correction. And many of them are scared to make changes, thinking that it would take them away from the sound the artists intended (the sound that was achieved in specially built room with super-acoustic treatment, i.e. a studio which also often uses room correction even with all that acoustic treatment).