If two people want to be at the vanity at the same time, it might be a bit tight. If your objective is to just have your own sinks, but not use them simultaneously, then it could work.

I posted a very similar question in January. Here is a link to that thread.

Here is a link that might be useful: Double Sink Vanity

We replaced a single pedestal sink with a double vanity in our master, and only size we could fit was 60" (5 ft). The vanity has been installed and but we are still waiting for the top to be delivered, hopefully this week. Our vanity is in the middle of the room with about 2 feet on one side (for the radiator) and maybe 4 on the other side (where the toilet is). This size looks to be good enough for us but if you have closer walls I'm not sure. I will try to post a picture once the top is installed and we are fully functional. They templated for the top about 10 days ago so hopefully that will be any day now!

We have two sinks going into a 55 inch vanity that will be used by my four daughters ages 10-20. We will have a black granite countertop and Kohler Caxton 2210 sinks, which is the middle sized Caxton (a plain sink perfect to undermount with granite) and I believe the bowl will be 17 by 15 inches. I plan to have the granite fabricated so that it is over the edge of the bowl by about 1/4" all the way around just to give me the look of more counter space. However, I didn't want to size down to the smaller Caxton sink (14" by 12") because that size is really too small for use on use on a daily basis. There will be only 12 inches between the sinks and they will be about 4 inches from the sidewall (and it's four inches because of the way I'd like to have the granite cut around the opening). The ugly shell-shaped cultured marble sinks were even larger than this, 19 or so inches wide and 15 inches from front to back, so this is a major improvement for us. Plus, the less counter we have, the less clutter my daughters will leave on it. We will have a GFI outlet installed sideways in the backsplash corner near each sink. Two 20 by 26 inch mirrored recessed medicine cabinets will be installed above the sinks with two three-light fixtures above those mirrors.

As you can see, we have a lot going into a very tight space. Cabinets are white, walls will be pale pink. I hope this helps!

My current master bathroom vanity is 63" of counter space (vanity is probably 62") with two standard self-rimming sinks. (I believe an undermount would provide a little more counter space.) This is plenty of space for the two of us, and I do not think that losing 3" of counter space would be a problem. I would definitely go with a smallish undermount sink to maximize counter space.

I wanted to give you an update on this because we had our vanity top installed last night. We have a Bertch vanity, only 18" deep, which is a little smaller than the standard I believe. Our sinks are Kohler 15" x 12" I think. As it is with the counter installed we have more than enough room for 2 people at the sinks. I did a rough estimate and it looks like we have a little less than 24" between the sinks but it certainly looks like more. I can try to post a picture when I get home tonight but in short, I would not be concerned about a 60 inch double vanity at all.