Welcome to the forum. All DVD+R are the same size. There are DVD+R DL that are about twice as big. +R are about 4.7 GB and DL are 8.5 GB. That doesn't directly translate to amount of time you can record on them however. That's determined by the Bitrate you record at. What do you plan to record with (computer? stand alone recorder?) and how do you intend to play it back? (again, computer or stand alone?) That determines how you need to record.