Hosting: how many hours of downtime per year right?

Depends on whether a leap year =)

How hosted — was convinced that most web hosts have far greater issues than uptime.
Yes, normally the uptime is 99+-0.5%. I measured their uptime with the help of specialized services that are tested in continuous operation specified site(hosting) with for example 50 different points of the planet (host-tracker.com) — and the figures around them were. But many hostings have another more significant problem is periodically overload the servers, and the response speed can reach several tens of seconds while the page loaded slowly, but that it would not affect the uptime, but has the same effect in terms of scaring away users.

Never seen another hosting the uptime is different from the ideal 99% — often it's just "on paper", but now began to use different services to monitor uptime, so sometimes there are confirmed data.
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Hosting choice for these parameters depends on your requirements — if you care about high uptime, look for hosting with them. But remember that no hosting is not uberezhennye from force majeure circumstances surrounding.

$ uptime
5:15AM up 324 days, 18:37, 3 users, load averages: 3.09, 2.92, 2.49
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almost a year ago, the caravan ran out of electricity and rebutals one of my routers, including we were under him. 10 minutes was a break (
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on my other server, the picture is roughly as follows:
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$ uptime
5:15AM up 575 days, 9:13, 2 users, load averages: 0.06, 0.11, 0.06
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gatehaus. The new DTS, I was there since, 3 years. The first year there were problems, often the power went out, tested the diesel generators and so forth. For almost a couple of years without incident. The latest incident — tried to Gracenote fry, not very successfully, a server had to rebutal and backup. To DTS no complaints.
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The conclusion is that, theoretically, no problems with uptime on the new servers hoster.ru. But it is in theory, and assuming that the new servers are hosted in the new DC

I have a month get a few seconds.
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And yeah, 99% is the norm.

a solid hosting company try to keep the annual rate in the range of 99.5-100 (no more than 44 hours of downtime per year).