Don't know exact number but its over 60. 3 are unused due to lack of time and all others are making at least some $$$. 5 are in planning But wow, 600+ is hardcore
I only own one hosted domain, but it has several subdomains with different sites. Because I'm working on content, not keywords or SEO for ad revenue, I'm just using subdomains of my main domain until each domain earns enough to pay for its own domain registration.
Have 3 undeveloped domains which I bought withiout much thought. 2 is bought with intention and after much research done Only 1 was seriously developed and 2 in production
I have one .org and one .com I feel like I'm in over my head with 2, jeez. Hearing about 600-1k is crazy for me.