Source: US Census. The median household income in the US is $50,502. This is some extremely useful data given that it is exploring over 114 million US households. If you want to know how most Americans are living this is a good figure to base your assumptions.
The myth that you have to wait 30 minutes or even an hour until you can swim after eating has been conventional wisdom for some time. The simple fact is, however, that swimming on a full stomach does not significantly impact your ability to swim.
Most experts agree that the Pre-Game meal should be eaten 2-3 hours before your match. If you're not sure what your ideal time is for pre-game, try eating two and a half hours before the match and then vary the time slightly for the subsequent matches, paying close attention to how your body responds.