How many hours are required for twin insurance

Greeting to All,

I am investigating the possibility of purchasing my own plane in the next 12
months.  With the soft prices on twin airplanes, they are starting to look a
little more appealing to me than a big single.  I have spent a lot of time
investigating costs associated with maintenance so I don't want to stir up
anything.

My question is....  how many hours of multi-engine time are insurance
companies looking for before they would sell you a policy for your own twin?
If this is not to outragous, then I will probably get my ME rating and then
rent a twin to build hours before my purchase.

If you have some information, please also include the underwriter that you
are referring to.

Thanks in advance,
Kevin