varied exercise times

i try to exercise 5 times a week, and take two rest days that are split up. I work out 30 minutes on the days i have to work which is usually 4, and 1 hour the days i don't work which is usually two. The reason i only do 30 minutes on work days is partly because of time constraints but also because i work an intensely active job as a nursing assistant which involves pretty much dead lifting 10-15 patients twice a day, and showering around 4 of them all while being on my feet for 8 hours walking up and down hallways. My question is, is this enough exercise. On exercise days i do the treadmill for 1 hour and increase my incline by 1% every 1/4 mile until i reach 10% for the last half mile. It shows i burn around 500 calories, then i do some light weight lifting for about 10 minutes, mostly upper body. On work days it is basically the same except i squeeze that into 30 minutes. burning about 250-300 calories. I eat around 1550 calories a day , high in lean protein, fruits and veggies, fresh of course, light carbs, and lots of water. I take multivitamins and CLA. I am not aiming for fast weight loss but long term health and maybe a little muscle, am i on the right track?