Sorry to say it again, but it depends
anteater said:
Where can I find information on those limits?
The amount of insurance you can buy depends on which company you are dealing with. The reason is some of the smaller companies will not want to put themselves on the line for larger amounts of insurance. If you are dealing with a larger company, say $50 Billion in assets or larger, then a good role of thumb is 15 to 20 times your annual income. This is known as the human life replacement value.
That being said, if you have a substatial reason for wanting more insurance, then you should be able to get as much as you want. A substantial reason could be owning a business or a large estate--coincidentially two of the factors used to detirmine you net worth.
the bottom line is if you work with a good company, have an agent that knows what they are doing, and you can justify the amount of insurance you want, you will be able to get it.