[oil pan 4]

Normally its the snake oil sales men at the point of sale that will tell you about how nitrogen will defeat laws of nature.

You can search and find web sites claiming that nitrogen in your tires will cause pressure to bleed off 40% to 60% slower. The standard time frame they use is "between oil changes" so I take that as every 3 to 6 months. It should be checked every month.
I think figures like that and the snake oil sales men at point of sale give people false security.

This is what you need to know. There are something to the tune of 8,000 wrecks caused by tire failure each year and hundreds of deaths.
I tried to search to find the DOT figures but all I get is traffic lawyers and stuff about ford explorers rolling over with firestone tires.
People shouldn't be putting nitrogen in there tires and be under the impression they can forget about checking them.