There are books in the game that, when read, give a 31 day boost or give a boost after 31 days.
Check the wiki for more information. https://wiki.torn.com/wiki/Books
Subscribing gives the highest chance of receiving a book at the start of each month. Otherwise they are random mission rewards and city finds.
Check the wiki for more information. https://wiki.torn.com/wiki/Books
Subscribing gives the highest chance of receiving a book at the start of each month. Otherwise they are random mission rewards and city finds.