X’s official Help page outlines the current technical limits for accounts on the platform. For posting, unverified accounts may publish up to 50 original posts and 200 replies per day; the daily limit for direct messages is 500. Email address changes can be made at most 4 times per hour. Users may follow up to 400 accounts each day, and once they reach 5,000 total followed accounts, they must also meet the platform’s specified ratio between followers and followed accounts to continue adding more.
Additionally, there is a separate overall daily posting limit of 2,400 posts, which is further broken down into half-hour intervals — this latter limit tends to be easier for active users to hit. All these limits apply cumulatively across all platforms, including web browsers, mobile apps, phone services, and APIs; they may be temporarily tightened during peak periods. The documentation clarifies that these are purely technical restrictions independent of other platform policies regarding aggressive behavior; once a time-based limit is triggered, users must wait until the corresponding time window ends before resuming activity.