What is the engine life expectancy of a 2008 Nissan versa...Or till how many miles could it last?

I own a 2008 Nissan Versa which I bought with 54,000 miles. Because of my driving habit, I've already added 50K miles within a year an half. Also. i maintained it very well with tune ups, engine intakes, oils flush up, and oil change ( Valvoline)... I'm would like a sincere answer and reference from someone who has mechanical knowledge....Thank you