It seems that Aeonmed don't like to make too many promises ... the manual mentions a response time (for the O2 sensor) of < 60 s.
Naturally, they also mention "the recommended oxygen sensor is produced by our company".
Meanwhile, the Viamed R-22MED (for example) boasts of < 6 s.
But on the plus side, it's nice that Ortus provide .pdf documentation directly from their
website.