1. Open Nero Video

2. Enter into "Make Express Movie"

3. Drag pictures into the timeline

4. Select all pictures, right-click "Set Duration"  then set duration, the gap will auto delete.

5. You also can select one picture then set duration, right click and select "Set Duration For All Pictures in the Track"

6. If you are in "Make Advanced Movie" , after you set duration, the gaps need to be deleted manually.