Android supports an event onLongPress. The question I have is 'how long' (in milliseconds) is the 'press' to trigger the event?
The standard long press time is what is returned by getLongPressTimeout(), which is currently 500ms but may change (in 1.0 it was 1000ms but changed in a later release; maybe in the future it will be user-customizable).
The browser uses its own long press time because it has some more complicated interactions. I believe this should be 1000, though again it may change in the future. It is not adding the different timeouts together.