Not much, IAS to TAS conversion perhaps. What is the question?
Be aware, though, that the 60 minutes rule is merely a calculation in the planning stage. It is a compliance exercise.
The connection to what the pilot needs to do in case of an engine failure is remote if any at all. There is a set of rules what needs to be done, but those have roots outside this 60 minutes planning restriction.
At this point I will on purpose not tell what the 60 minutes rule actually tell us, because rephrasing the original legal text only leads to ambiguity. It is written the way it is, meaning precisely what it says.
If you look it up and paste here with a reference, we can go word by word and clarify as required.