What is it about 6 weeks?

I noticed a lot of things can get better in 6 weeks.

• I had some health issues lately and after 6 weeks of getting my habits under contol I gained back my health.

• In email marketing when you want to get back deliverability on gmail or hotmail it usually takes 6 weeks

• My newsletter for remote-working parents gained traction after 6 weeks

• Kids get their colic after 6 weeks usually

• And after 6 more it’s gone

Do you have any examples to back it up?