Can I use a S3 bucket object as a push notification (Polling object) without any issues?

Background : Due to quick development we have our servers in PHP and implementing services like Pusher and Socket.io is not an option.

So, we are planning on using AWS S3 bucket files and the data content, to update them and to poll them and see if there are new messages or not.

Would like to know how many requests/second can an S3 file or an S3 Bucket handle ?