Play -> How long is a tape

The tapes intended for recording had very specific times.Although occasionally there were released tapes of different years, those who prevailed was sixty and enenintares (sixty and ninety minutes). However not long ago I realized that the time a tape is playing is very relative.I always prefered the taperecorders that were not terrible automation for ritual reasons. When I listen to a tape while doing something, eventually by ending the A side, i need to go to shoot the cartridge. In that case I always finish what I have to do and then I get up. So, as if by magic , later by pussing play,listening to the second side brings a little bonus gift throughout the release of serotonin my neuronal receptors.In this biochemical way , a tape's listening time, is released by the time it plays, and adjoin the time not playing in a system of immediate reward. Going to shoot the catridge...