Questions in the Reopen queue don't last for more than a minute, so I'm curious, how is there such a large time span between the second-to-last vote and the last vote?

• http://stackoverflow.com/review/reopen/1514370#./1514370?&_suid=136077430928106676949985798315
• http://stackoverflow.com/review/reopen/1514046#./1514046?&_suid=1360771276359011990456602324828

In the first example, at the time I'm posting this, there is a 17 minute gap between votes, and in the second example, there is at least a 30 minute gap between votes.

Here's a real weird one:

• http://stackoverflow.com/review/reopen/1474597#./1474597?&_suid=136077623335908487293546818277

The second-to-last vote was on Feb 7 at 13:39, and the last vote was yesterday?

Is this just a case of leaving a browser tab open and coming back to the tab later, taking great pains to make sure the question needs to be re-opened or not, or is it something else?