Again, as Distill requires upgrade (read "to pay") to enjoy an Useful minimum time of monitoring.
Uninstalled.

"Minimum interval for your account is 6 hours."

6 hours for free accounts.
That's a Shame.
Page Monitor for Chrome gives a minimum interval for free accounts of One Minute.

I do not use Opera as I'd like because of the lack of good and Free add-ons.