From GA:
Pageviews per hour:
1900 : 1,984
2000 : 2,185
2100 : 2,354
2200 : 2,785
2300 : 1,554
0000 : 644
As you can see the site "appeared" to be up, as this follows the usual trend when comparing it to same time last week and same time last month (looking in GA I can overlay them ontop of each other). That said if it locks up for 1/2hr then goes back to normal then its not always obvious from these stats.