Shaftmaster
I am not sure that your question has been answered.
I think your question is:
If you are operating 120 minutes from an EDTO enroute alternate, and that edto enroute alternate requires 60 minutes holding, do you need to now fly 60 minutes from that alternate (i.e. divert 400 or so miles closer) so that the 120 minutes is made up of 60 minutes to get there and 60 minutes to hold....
Is that your question?
If so - no..you wouldn't divert to stay within 60 minutes for a tempo, or 90 minutes for an inter....