couple questions about sub veteran rewards

[XgungraveX]

Yes, you can buy 180 days in any way and you'll get the reward immediately. You can select to buy 180 days of subscription when setting up a payment with a credit card or crysta or whatever, or you can go buy 3 game time cards and add them to your account. Your account needs to be on Standard instead of Entry to buy more than 30 days with a subscription. It will also tell you what rewards you'll get as soon as you pay - you won't have to wait.

does my time to be run out before i add time?

[Keydah]

does my time to be run out before i add time?

I don't think so. Go to the Mog Station, cancel your current subscription (it won't take away any days you have left - it just turns off the recurring auto-payment. Do NOT click "Cancel Service Account") and then click "Add subscription." You should be able to do the same thing pictured above (selecting 180 days and getting your rewards)