Mandy : One touch recording is a form of instant recording. You don't have to set the day, time, channel, etc. It will record instantly from the channel you are watching. Recording time can vary from 30 mins to 4 hrs (depending on the length of the programme).
One Touch Recording is usually activated by pressing the record button several times; once to start recoding and then each press after that will add an additional 30 minutes to the record time.
What it does is that it not only activates recording, but also sets a timer that counts down. When the timer expires, the tape will stop recording automatically. The timer can be set in increments from minutes to hours. - Reinhart