my dr will not do both at once, and gave me no other option than to wait 2 months or so. I did first one 1/4 and second one is coming 3/14. He insists recovery is quicker, easier, better and the cardio thing as well. He just all around feels waiting 2 months minimum is best. All the docs have their reasons.
I have an Otis knee as well, I am wondering if the type of knees they are using may make a difference. Not sure, but I spent so much time researching and visiting so many doctors until I found the right one for me, so I figured I better trust him and I do.
In all honesty I don't think I would want to go back in personally and do it at 5 days. There is no way your newly operated knee would be ready to support the other one. It would be like having them both done at the same time. Now for me I am at 8 weeks now and will be at 10 weeks when I get the next one done. My new knee now feels better than the old one, so I am comfortable to go for it. I am still tired, still have pain, but I am ready to do the other one because I am so anxious to move on.
This is just my opinion, I may be considered a whimp, but there are several people on this forum that have had both. Hopefully they will reply to you and you can make the right decision for you. Good luck either way. Keep us posted.