Health monitor GET interval and timeouts

The default timeout isn't often changed unless a specific reason requires there to be a quicker fail-over. Since the F5's main goal is to provide High Availability, the interval is kept shorter rather than longer. A single HTTP request every 5 seconds does not provide much strain on most modern web servers but even a 30 second outage of a site can cause huge issues if other people are relying on that service. F5 has decided a 5 second interval and 16 second timeout is a good middle ground and most people don't see a reason to change it, but feel free to tune it to your specific needs as long as you know the impact it can have on the system as a whole.

Hope that answers your question. If you have any more, I am sure I can help