Sony DVS-7300 User Manual page 350

Time Settings
Setting the effect duration
Use the following procedure.
1
2
3
The effect duration also changes when you insert or delete key frames, as
described in the following items.
8-16
Chapter 8 Key Frame Effects
Press the EDIT ENBL button, turning it on.
Press the EFF DUR button.
Enter the numerical value in minutes, seconds and frames (mm.ss.ff)
from the numeric keypad, and press the ENTER button.
For example, enter 3.7.15 to set a duration of 3 minutes, 7 seconds and
15 frames.