X-Weaver IJJI Ripped Site

Hello guys, im sorry im asking alot of question here, but im not that professional to fix everything alone, so i need your help in one last thing tho.

I downloaded X-Weaver's Ripped ijji site, everything works fine, shop works fine, also register...
but how can make a duration to an item that belongs to item shop,
i mean, when the user buys an item, it gives him a period, after that period the item that he bought goes out of his storage
also how can i make multiple choices for buying an item
for example I wanna buy something,
in the same item, i can choose 1 week = Price, 2 weeks = Different price, etc...

Thankyou ^^

Guys ! I need your help nuu! !

I guess for event items?

for the shop items, or event its the same, the admin panel doesnt give me an option to put a duration to any of the shop items,
please help me as fast as u can guys

guys i know its freaking illegal to put double post, but i need ur help really bad ! the thread has been posted 3 days