Based on the knowledge sources, events that have been sent to your Mixpanel project should appear in Lexicon within 30 days of being fired.
Specifically, Mixpanel's Lexicon UI shows events that either:
1. Have an associated schema, OR
2. Have been sent to your project in the last 30 days (though this look-back period may be shorter depending on your data volume)
As mentioned in the documentation, "Mixpanel's report dropdown menus hide events that have not been fired within the last 30 days" with the exception of events that have been modified via the Lexicon interface (by adding a description, hiding the event, changing the display name, etc.) Debugging: Check for Hidden Events and Properties.
If you're not seeing your events in Lexicon immediately after implementation, they should appear within a day or two at most. If they don't appear after that time, you might want to check if:
1. The events are actually being sent successfully
2. Ad blockers or DNT settings are interfering with your tracking
3. The events might be hidden in Lexicon by a project admin
For mobile implementations, note that events may take 1-2 minutes to appear because Mixpanel's mobile SDKs buffer events for 1 minute to conserve battery life and bandwidth.
