Taking average maintenance and driving style into account, how long and/or how many miles would a typical Lexus RX350 last until breakdown?

I bought a 2007 Lexus RX350 in April. It had 173,### miles on the odometer. I hope to know how long I should expect it to last.

I plan on trading it out someday for another Lexus SUV with actual 4x4 - a Lexus LX or GX. The year model range will be between 2008 - whatever year is 5 years before the date of purchase.