@louannwarren Thank you Lou Ann for your interesting comment, I suspect from start to installation depending on size and complexity it would range from many months to a few years:)
@pcoulson one of the painted churches in Texas had stunning stained glass windows. It had burned to the ground in the 1920’s and all that remained were the windows, broken and on the ground. The congregation sent them back to Germany to be repaired, they raised money for years and finally get them back after 8 years. At least I think it was 8 years. They detailed the work and time involved in making stained glass windows. I was so struck by that because I had never really thought about it.