Parking at Riverside T-stop

Does anyone know how long you are allowed to park at the Riverside T-stop? I read that the limit at Alewife in 7 days, but I need to park for 9. I need to take an early morning plane and want to take the train and leave my car at the end of the green line. If anyone knows the answer to this I would really appreciate it!

It would probably be safer to use Logan Express in Framingham, that has long term parking.

Logan Express is good, but they kill ya with the parking. Where do you come from dromond?