By “time defined” I mean set start and end dates. Seems to me that if these are set, then both parties have agreed to give and receive work (to provide and carry out or whatever are your preferred words) until the end date is reached, regardless of agreed deliverables. That is MOO as I understand.
And yet they don’t.
This is because all the received wisdom when applied including working practices has over and over again been determined outside IR35 by reference to…