Anyone use both cialis and viagra within 12 hours of each other?

I’m going to an event of sorts where the high chance of sexual encounters over 24 to 48 hours will be high. I’m used to taking Viagra and 100% works however the problem is it only last four hours and instead of reducing I consider taking Cialis. Has anyone ever taken both of these medications together?
My concern is that the Cialis will not work as effectively as the Viagra