Ok this is how long it takes for that planet to make one orbit:

That’s an orbit 6,900 times the distance from the Earth to the Sun, or roughly 643 billion miles (one trillion km). At such a huge distance it takes almost 900,000 years to complete one orbit.

The planet was first spotted in 2008 by Space Telescope Science Institute astronomer Neill Reid and co-authors.

Can you get your mind around that?

And here is a related video about Neptune’s orbit:

‘While Neptune slogged around the Sun over the last 165 years, a lot has happened on Earth in that span of time. This video chronicles some of the major events that occurred on this planet during a single Neptune orbit.’

thanks to sci-news.com for the great info