Yes, it is time-consuming. Ensuring all teams are included. Putting the Note in the corrert format. Including Note2, especially for variations and errors. Ensuring the numbering system is correct, especially using "NNO" when cards have no numbers. Too many sites add numbers to unnumbered cards or leave off prefixes to alphanumeric numbers. Adding an incomplete/incorrect checklist just makes more work for us OCD perfectionist types (lol).
Thanks for the help and welcome to world of checklist building.
Someday my cards may double in value and then be worth half of what I paid for them.