Duration of CO2 laser results may last years

All fractionated ablative lasers such as Active FX and Fraxel : Repair which are CO2 based lasers will stimulate collagen growth. This is something that deep chemical peels can also do with downtime and tretinoin creams can do with no downtime. 

Once you stimulate the collagen growth, this new collagen will last years, hence the prolonged results with these lasers. There is also a great  fractionated  erbium yag laser that does an amazing job on wrinkles and heals in 2 days instead of 3-7.  So, I suggest:

1. Find a doctor with a lot of training in skin such as a dermatologist or plastic surgeon
2. Find the right doctor with the right laser for your needs and
3. Be prepared for great laser results with some downtime. 

Good luck!