Can I do this every day for the next six weeks?

I may be jinxing this, but I had a four-day weekend and each day I went to the gym and spend 45 minutes on the arc trainer.  I must say that I am quite surprised (pleasantly so) that I am able to do this.  I used to do this at least three times a week but it's been a while since I did this.  I injured my ankles a few years back and started to do weight training instead.  I had not been to the gym for at least six months before I got sick last year and did not go to the gym all year.  I really thought I would last just ten minutes and then be gasping for air but it was like I never stopped. Each day I challenge myself and rev up the intensity.  I just hope that I can keep it up because the gym is not in the most convenient place for me.  My goal is to try to do this every day before my upcoming surgery.  I expect that I will miss a few days but I'm going to try.