Depending on how many attendees were in a session or how long ago the session was, the real-time report generation can take upwards of 10 minutes and will occasionally time out. If the system cannot reliably produce the report data in real time, then either the reports need to be pre-generated and stored locally so that requested downloads are immediate, or you need to adopt a system similar to what PayPal and eBay use, where the requested reports are generated offline and an email is sent once the generation is complete, along with a direct link to the download. The current system, where you have to keep the browser session open for an extended period or else you lose the request, is very cumbersome.