Restrooms.....

My venue has two single stall bathrooms located inside. My wedding location will be outside by the water. There will be about 90 guests tops. The event coordinator for my venue informed me that for weddings over 100 people they require you to opt in for an additional restroom outside. (it’s not like a construction site porta-potty, it’s like a souped up bougie portable bathroom.) but she said because I will only have 90 people tops attending that it wasn’t necessary. I feel like I should definitely opt in for one if not two extras. I told her that and she said I can opt in for however many I think my guests will need, but she again said it’s really not necessary for less than 90 and the 2 they have inside would be plenty. I’m almost positive I’m going to opt in for at least one extra one, but does anyone have any idea on what a sufficient amount of restrooms are for 90 people? I guess my concern is that I’m just trying to avoid the “bathroom lines “and want my ppl to feel as comfortable as possible.