If you hit HON this year, it will be valid until 02/2017 (rest of the year, + 2 years + 2 month until end of February)

If you want to hit HON next year, wait until March or April to pass the 600k. So you will get status until 02/2018.
Because if you reach 600k too early in 2015, they will only give you the status until 02/2017.