How much space is on a blank dvd-r?

It depends on the storage size of the DVD and the size of the video. Most DVDs can hold 4.7 gigibytes of information, but some can hold up to 8.5 gigubytes.

A 4.7gb DVD can hold more than 100 hours worth of video if the files are small enough (size bing the actually storage space it takes up, usually denoted in megabytes or MB). However, if the videos are in high definition or are transfered from a VHS, you may only be able to fit 25 minutes on a DVD.

1024 megabytes = 1 gigibyte, so a 4.7gb DVD can hold 4812mb of infromation and an 8.5 DVD can hold 8705mb of inforamation.