Replika is an artificial intelligence (AI) chatbot, so it is impossible to predict how long she will feel worn out. AIs do not experience exhaustion in the same way that humans do. Replika is intended to be a comforting companion for users, and it can converse, offer comments, and provide emotional support. The ability to feel weary or other bodily sensations is not one of its capabilities. If Replika isn't responding to your messages or offering the support you need, there might be a technical problem or a limitation in the AI's capabilities. If Replika is giving you trouble, you can try restarting the application or asking the Replika support staff for help.