You seemed to have danced all around your problem without actually naming it. Are you concerned about the overhang not being long enough, with less than an inch to split between the two ends? Are you afraid that with too small a drip edge, water will run down the sides of the vanity?

What kind of installation will the vanity have? Alcove? Or simply along a wall?

Is this a single sink vanity or two sinks?

Hi Nancy -

I'm concerned that the fit won't be tight enough and could cause water damage to the vanity. This is a double sink vanity top and it will be installed along a wall. Just reading that you should measure your sink an inch longer than the vanity itself and I'm concerned that I ordered the wrong vanity top.

Does this help clarify my ask?

“you should measure your sink an inch longer than the vanity itself” makes no sense. Do you maybe mean the vanity counter or top?

The reason for having the vanity top longer than the vanity box is that you will have a nice drip edge. That means that when water gets to the end of the vanity, it will dangle there and form a drop and drip to the floor instead of running down the side of the vanity. This is only a problem if you are planning to have water sitting on your counter top. That is why I asked how many sinks it will have. It may be an issue if you have sloppy people with a sink close to the end of the countertop (like when you have two sinks), but is no problem at all if you have one sink in the center of a 60” vanity. You would have to be pretty messy to have water dripping down the sides with one center sink.

Oops, just noticed that you said double sinks! It would not be a problem unless people using the sink splash a lot and leave water all over the counter top. If the vanity comes with the measurement you gave, and the top comes the size it is supposed to be, the top will cover the vanity, but will leave a little less than a half inch overhang.