How to make the special effect time of the transition in the clip longer?

Hello, using PR software is more professional. The reference method is as follows:

For example, two videos add a transition effect and a page turning effect.

If you want to modify the transition duration of page turning effect, make the duration longer or shorter, please refer to the steps:

1. Here in the timeline, the mouse is placed on the effect of turning pages.

2. Right click will pop up a list with only two items;

3. Select: Set the transition duration.

4. A dialog box will pop up; Set the required time in the dialog box, and then click OK.

Then, complete the transition duration of modifying the page turning effect. You can try it by analogy.