Put a raw egg in its shell into a pan of boiling water (the water should cover the egg). Depending on the size of the egg, time it for 3 and a half to five minutes, remove from the water and...
About 4-5 Hours at the most, afterwards they start to get rubbery and pretty nasty. Also I wouldn't suggest leaving them out at all due to the fact that Boiled eggs tend to do some funny stuff when...
to cook: 20 minutes on medium heatthey last one year refrigerated iff it looks fuzzy and blue or green that means it is the best it can ever be ( or it means that it is old and moldy and deadly)