ᐅ What is the ideal tile size for a bathroom?

A dealer showed me floor tiles suitable for the bathroom, toilet, hallway, kitchen, and utility room, as well as wall tiles for the bathroom, which I liked. However, they are quite large:

Floor: 60 x 60 cm (25-- €/m² (10.8-- $/ft²)), R 10 AB; Thickness: 10.5 mm (0.41 inches)
Bathroom wall: 42.5 x 119.2 cm (48-- €/m² (20.0-- $/ft²)); Thickness: 10.5 mm (0.41 inches)

Advantages:
- Square tiles don’t create a lengthening effect in a narrow hallway
- Large wall tiles, especially in the shower, mean fewer grout joints, resulting in fewer issues with dirty or damaged grout

Are there any disadvantages?

More expensive to install

The tiles are not particularly large. 60x60 cm (24x24 inches) is almost standard.

The 60 by 30. Around 22 per square meter.

We are currently getting 120x120cm (47x47 inches) tiles for the floor and walls. I don’t see any disadvantage with large formats; the fewer grout lines, the better.
Edit: One “disadvantage” is that you need to put more thought into the laying pattern.

The only downside is the price. It is really expensive compared to our smaller ones.