Right, we discussed this a few days ago. Seems like the answer is, indefinitely!
Fairfax made about $2.4b in net earnings APART from investment gains last year (underwriting, interest income, share of earnings of associates), so it is at about 13 times earnings even without its investment gains (or 9 times earnings if you include the investment gains. On the thesis that they will never pick good equity investments or make any money from them except by luck, they're still cheap, half of Intact's multiple. And Fairfax's might occasionally make a gain on investment too...