United MileagePlus elite status earned this year will expire on January 31, 2024. After you earn any MileagePlus status level, you will keep it for the rest of the current calendar year, the next calendar year, and January of the following year.
To be able to reach the first United MileagePlus elite status level (Premier Silver), you need to fly 8 flight segments and earn 3,000 PQPs (Premier Qualifying Points) or fly 4 flight segments and earn 3,500 PQP. You must satisfy a given status level's qualifying requirements between January 1 and December 31 to reach or maintain that status level and enjoy its benefits.