Recovery from bypass surgery

I have a special friend who had bypass surgery in late November.  He has been doing well, but now 3 months post op, he still has bouts of depression.  He also by long standing habit internalizes all his stress. He is over 70 years old but prior to this a very energetic person.  At what point in his recovery should he make a definite turn in his recovery?  Mentally and physically?  Thanks for your answer

[Irishking23]

Assuming he did not have any post-surgery complications or an adverse drug reaction, I would think any bouts of depression would be over 1 to 2 months maxiumum after bypass surgery.