Based on this plan it looks like approximately 7.5 feet long. It is a custom designed and built vanity made of maple. Not sure on the stain but you may want to ask in the Comments under the story here:

https://www.houzz.com/magazine/bathroom-of-the-week-a-wet-room-strategy-and-nods-to-retro-style-stsetivw-vs~148160373

I had to upload the plan separately from the Pro's portfolio, so they won't see it here but they have a better chance of seeing it there. Thanks!