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There isn't direct documentation within Apps Script that specifies the quota for daily hits on a web app. However, there are resources that indirectly shed light on this:
Quotas for Google Services:
https://developers.google.com/apps-script/guides/services/quotas This page details quotas and limitations for various Google services that Apps Script interacts with. The relevant quota here is for UrlFetch, a service used by Apps Script to make requests to external URLs. Google Apps Script has a daily quota of 20,000 UrlFetch calls for GMail accounts. If you're using Apps Script with Google Workspace accounts (like Apps Script for your domain or Apps Script for Work), the quota might be higher.
Concurrent Execution Limits: There's a limit of 30 concurrent executions for Apps Script web apps. This means a maximum of 30 users can access your web app and execute the script simultaneously.
Here's how these relate to your daily hits:
If your web app logic primarily involves internal operations within the script and doesn't make many external calls (via UrlFetch), the daily limit is closer to the 30 concurrent executions.
If your web app makes frequent UrlFetch calls (to external APIs or services), the limit becomes the 20,000 daily quota.