dvr time

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Really, there's no "gauge". An easy was is to have "TiVo Suggestions" enabled. If its recording a LOT of suggestions, then you have a LOT of space left (as the TiVo will never cancel or use space planned for an upcoming recording). Hacking the TiVo, however, can give you a gauge via TiVoWeb or on the TV...
 
If you do a search on the TiVo Community forum for "free space indicator" you'll get a lot of results. Other search strings can be "recording time left", "recording time remaining", and even "gas gage" (yes that is misspelled:))
 
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