Does United have 24 hours to change a flight?

https://support.communitybrands.com/hc/en-us/community/posts/30757675077261--1-888-829-1467-Does-United-have-24-hours-to-change-a-flight-24-7-Support

Well, United Airlines allows passengers to change flights up to 24 hours before their scheduled departure time, for free and with no penalties. After the 24-hour period, United Airlines Change Fees will be $200 to change the date and time of their flights.