Hey dickytall,

Thank you for reaching out to us.

You can adjust the auto-rotate time in your nectar slider settings by changing the slide time. Here's a screenshot of the same:

We also have a guide to assist you with the same https://themenectar.com/docs/salient/nectar-slider-plugin/.

Kind regards, 

Hey Again,

Please add a value in here: 

Click on Image to View Larger

Thanks 

Hello again,

You can try and adjust the slider type to the options in the screenshot below and change the duration:

Alternatively, I am afraid this request would require custom work. Try using a Third Party Gallery Plugin if need be. 

Thanks,