What's a rough monthly estimate? Early 40s, excellent health, desk job for the most part.

Your employer doesn't provide it in their plan?

Nope. I'm self insured.

Decent rough estimate is about 1% of your gross. That's going to have some variability based on your career, bells and whistles on the policy, company that's insuring, extra curricular hobbies, etc., but it's a decent rule of thumb.

If you're primarily a desk job with less than 10% of your time doing anything the company would deem risky (around heavy equipment, inspecting job/construction sites) a basic policy might be a little lower than 1% but being in your 40's that's where I'd assume the starting point will be.

Supposed to be 60% of your income

One quick addition: once you get above 200k, the percentage of your income that you can get insured starts dropping. If you're over 500k, you're capped at about 240k of coverage. There are a few creative approaches to push that number up a bit but that's about the most you can get on a single policy. Once you get into that range, depending on the kind of work you do, the 1% rule obviously doesn't apply. Surgeons and most medical specialties cost more than 1%. Accountants, attorneys, and most business owners making that kind of money tend to pay less than 1%.