Oh no, you didn’t account for leap days. I believe there’s been 30 since 1907, so you’ll need to add to your total, and maybe a few extra buffer days to make sure everyone knows why you’ve done this so that no one else invents completely artificial plastic either.
Bitch could literally turn back time
How many rounds around earth til un-inventing plastic?

1 turn = 1 day
Completely artificial plastic was invented in 1907 - 118 years ago.
1 year = 365 days
118 years x 365 days = 43,070 days
So 43,071 rounds should do it, and then just clonk Leo Baekeland over the head or something.
Oh no, you didn’t account for leap days. I believe there’s been 30 since 1907, so you’ll need to add to your total, and maybe a few extra buffer days to make sure everyone knows why you’ve done this so that no one else invents completely artificial plastic either.