Just like most Volvos, if a lot of money was spend in maintenance, and if you continue to spend a lot, it'll last another 300k.
As an example, my buddy is a Volvo mechanic, he buys some Volvos for dirt cheap, because of timing belt issues or what not that was neglected, and its so expensive to fix if you're the average user so you just want to get rid of it, he fixes them and resells for profit. He also has a V70 with 400k, the thing runs like new, but obviously he does all the maintenance before it breaks.
And if you need anything done you can always PM me, he has a lift at his house and does amazing work at a decent price.