Help needed with making 15 or 30 day HKs

[StateOfMind]

Sorry I am newbie , if I do like this I will get 15 days or 30 days HK ?
1. [Hunter Kit (8 Hrs) Once 99 RPs 299 E-Cash] x 2
2. Unique Forge Preservation Stone (Novice)No Expiration129 RPs 399 E-Cash x 1
= 198 RPs + 129 RPs = 327 RPs

Thank you for your information.

just buy the regular preservation stone.. not the novice one.. and its good

also, to forge it, u need to use the recycle system button, ingame..