Should I fry my cannoli shells in lard and for how long can I leave them unfilled

I'm making cannoli for the first time and online recipes are confusing because each one says something different. I want to fry mine in pig lard but im not exactly sure how will it affect the taste? Should I fry it in sunflower oil instead? Also for how long can I Ieave empty shells on a room temperature (in an airtight container) submitted by /u/DoubleGeologist749