how long was the perseverance rover expected to last

Perseverance was expected to last at least one Martian year , which is about two Earth years. NASA also designed it with a power system that could potentially keep it working much longer than that.

What that means

• Planned mission length: about 2 Earth years.

• Possible actual lifespan: far longer, because its power source was built for extended operation.

Simple answer

So, the short version is: NASA expected Perseverance to last around two years, but it had the potential to go much longer.