You mean pre-loader of Revolution Slider, right ?
The duration of pre-loader depennds of the time for load the first slide, this is automatically calculated by the plugin. If you open the website with a slow internet connection the pre-loader probably will appear until the first slide totally loads.
Regarding the pre-loader red we couldn’t reproduce this issue here. Please share with us the code you are trying or better yet send a online link of your website for us.