Sure you can, as long as nobody complains too much about problems during night if those 2 people can work overtime every now and then.

You can probably even promise 99% uptime (sounds good enough to most buyers probably?) even if people sleep 8 hours a day as long as the failures comes no earlier than than 15 minutes into their sleep and only happens at most once a month (1% of 30 days is 7,8 hours).