It seems like it. Pick a site, choose to block it all day, use blocking method delaying page and set delay time to a selected number of seconds. Seems to work,

It seems like it. Pick a site, choose to block it all day, use blocking method delaying page and set delay time to a selected number of seconds. Seems to work, but haven't tried this configuration before. One has to sit through the delay, if you switch context, the countdown stops(!)