When I was one the Duty Operations Controllers at RAF Benson a few years ago we were working 3 days 3 nights 3 off. As you can see we worked 72 hours with effectively 2 whole days off as your first down day was a sleeping day. Needless to say a few months of this and we were all feeling the strain, so 70 hour weeks over 2 years really does beg further information. If however this was indeed the case I take my hat off to him as he obviously has the stamina of a stallion.