Hi SD1K,
You didn't tell us how he felt after that?
I think the most I have done is BKK-HKG-LHR-DXB-LHR-MXP-LGW (12 hr stop)-DFW in 3 1/2 days. It only required 2 nights on the plane and my 12 hr stop in LGW was an evening on the ground at a friend's house. I felt pretty tired after all that flying even though it was in F. Cannot imagine how your husband felt!
I think Tfung may have done more though:
http://www.flyertalk.com/forum/Forum81/HTML/002779.html