I’m probably outdated on this, but old Excel format have an upper limit of 65536 rows and the new format has a limit of 1M rows. So that’s where I would estimat

I’m probably outdated on this, but old Excel format have an upper limit of 65536 rows and the new format has a limit of 1M rows. So that’s where I would estimate the limit of upper bound. Could be less, can’t really think it’s possible to have more.