The answer to your question varies widely. . What kind of paint? House, car, boat, masonry? Interior or exterior? Lawn furniture or lawn mower? A clean, well prepared surface....or not? As a general rule the better prepared a surface is the more durable and longer lasting the paint will be.
If you had two small pieces of 2x4 and painted the first one with exterior paint then set it outside in direct sunlight. The second one you lightly sanded with 60 or 100 grip sandpaper, wiped all the sanding dust off of it`and then applied a coat of exterior primer, let it dry and then paint it with exterior paint. The paint on the prepared (prepped) piece of wood could last indefinitely. While the paint on the hastily painted first piece would begin to degrade rather quickly in comparison.
The sun and an unprepared surface are the most common reasons for paint failure.
Paint applied on furniture without preparing the surface can only last at most 3 months.
timber is expected to last at list 15-25 years.
it will not degrade and will last for long
A few minutes
Rustoleum is a brand name; however, as long as the surface is clean, oil-free and dull, you can paint any oil or latex based paint over a latex surface.
another 5 years
The paint that should be used on a gym floor is an oil based paint. This paint adheres best to the surface and lasts a long time.
For as long as it takes for the surface to be completely dry.
Paint Tool SAI trials usually last between 30 to 60 days.
one life style
Paint fumes should last 2-3 days at most. If they persist put a fan in the room.
they can both last a long time if they are cared for properly, but non-metalic paint lasts slightly longer, because it cant rust out.