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Does that mean he's running 61k sites on a single server? Even if each site gets one single visitor per day, that 61k visitors for the Server. There is no way the server can manage that traffic.
Sorry, but do you really want a static site? Just pay for a good one.
A $20/month Linode can handle 4k static pages per second on Nginx. I've heard tell of people pumping the cheap Linode server up to 30k views/second, but I haven't been able to break 4k.
Assuming text pages, the full 61k sites could be accessed every 15 seconds. If the pages have nontrivial graphics, then you're (as others have mentioned) far more likely to be bandwidth-limited. If the site has an unmetered 10Mbps connection, then it could serve 1Mbyte per second: If each of those 61k pages contained 1MB of data, then it would STILL be able to serve (at most) 86k pages per day.
It's likely that most of the pages hosted will be accessed less than once a day, though. Power law distribution of the long tail [1] and all that. And a megabyte is a lot of data for a single web page; I would imagine that with a 10Mb limit on the entire site, it's not going to be a place to host sites with tons of images.
Assuming you're not being sarcastic: a small vps could serve an order of magnitude more visitors per day than that when it's just static files, many orders of magnitude more on a well configured server and many many many times more than that on a powerful server. The bottleneck for this will probably be bandwidth.
That is an amusingly small amount of traffic. A typical server should be able to handle thousands of requests per second. See the web framework benchmarks. When you add in the fact this is serving static pages you will likely blow out the bandwidth first. Put it behind cloudflare or another cdn and you should only need a second server for availability.
Aside from the other evidence that this is terribly thought out, serving 61,000 static pageviews (or if average pages per visitor is more like 2: 120,000) shouldn't be a problem on even a cheap server.
Even with uneven traffic that's probably 4-5 pageviews/second at most. The cheapest linode or AWS instance can handle that for serving static files.
Does that mean he's running 61k sites on a single server? Even if each site gets one single visitor per day, that 61k visitors for the Server. There is no way the server can manage that traffic.
Sorry, but do you really want a static site? Just pay for a good one.