As long as it is a V.10 card, and not a line current card, I don't really mind how long it takes.

I assume it has a V.10 cable (with the DB-25 connector) [1] attached ?
[1] https://pinouts.ru/SerialPorts/eia530_pinout.shtml
As long as it is a V.10 card, and not a line current card, I don't really mind how long it takes.