It's like the same as asking the length of a piece of string.
They can come in all different shapes and sizes and mostly depend on what they're made for, or what they're made from.
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"For a medicine cabinet above a vanity, the National Kitchen and Bath Association recommends that the bottom edge of the mirror be 40 inches off the floor a good height for most people." If you are not of average height, put the center of the mirror at the height of your eyeballs. Be prepared to move it if you try to sell the house.
The standard height they are placed is no more than 48" above the floor. I mount my switch boxes with the top of the box 48" above the floor. You can install them lower if you wish but no lower than 15" above the floor.
In general, your chair should be high enough for your feet to rest flat on the ground and low enough so that your hips are above your knees. You shouldn't bend your knees more than 90 degrees. 30 cm is a good distance between the tabletop and the chair. Standard-height chairs are 45 cm off the ground because a standard table is 75 cm tall. You can get the correct height office chairs at Value Office Furniture online store.
6 inches above the counter is good. Counters are 36 inches high, so 42 inches to the bottom of the box.
The standard hanging height for your towel rack seems to be 48 inches above the floor. This will leave leave enough space below the bars for towels to hang freely. If, however, you hang the towel bar in a children's bath, place the bar at a height of 36 inches.