"Node Down!" email displays "at least 0 hour"

My preferences indicate that Tor Weather should email me when the node I'm observing is down for 0 hours. The "Node Down!" emails that I receive contain the following text:

It appears that the node (...) you've been observing has been uncontactable through the Tor network for at least 0 hour. You may wish to look at it to see why.

I think it should say "at least 0 hours" instead.

Trac:
Username: kraai