scheduling manual recordings online?

I recently needed to manually record a 6hr block recording on one of my TiVos (Premiere and Roamio). I wasn't at home so needed to do it remotely. I would up doing it online, but basically recorded it two different times and simply extended the recording on each end (2-3hrs).

Is there any way to online schedule a manual recording like I can on the actual box?

i.e simply record ch48 from 12 noon to 6pm (regardless of how many shows fall in this time frame).