After my first round of
PMMA a couple of months ago, I noticed some changes way after the 6 week mark and I didn't pump, so I think the complete healing process takes way longer than 6 weeks. My wife even told me that she felt it was different (less swelling), even though I kept my EG gains. I started pumping 3 to 4 months after the treatment and I didn't see any changes since.
In sum, heavy pumping after 6 weeks might be a little bit early, but 3 to 4 months after the procedure seems fine.