Sony SLV-EZ727AZ, SLV-EZ725AZ, SLV-EZ424AZ, SLV-EZ121AZ Operating Instructions Manual page 51

When the timer settings overlap
The programme that starts first has priority and the second programme starts
recording only after the first programme has finished. If the programmes
start at the same time, the programme listed first in the menu has priority.
Programme 1
Programme 2
Programme 1
Programme 2
about 20 seconds
will be cut off
about 20 seconds will be cut off
Additional Operations 51