I just counted my Hue lights in the apartment I live in and got up to 30, 90sqm.
I have some bulbs, 4 spot lights, lightstrips around the living room. Lamps around the studio, bedrooms, living room. If you add bias lighting and indirect light by bouncing off the ceiling you add up quite fast.
Granted, I built up this setup over some time, finding the best use for each set of lights I got but I can definitely see how you could get up to 100+ in a larger house.
Easy to reach if you use spot lighting. I counted a bit less than 30 in a (tiny for American standards) 100sqm house.
Pretty normal house, just under 200 square meter. But for example the kitchen alone has 2 ceiling lamps with 4 spots each, 6 lamps for countertop lighting and 2 in a wall of cabinets. So that's already 16 lamps in only the kitchen. It's more in the living room.
Even a bathroom easily has 6 or 8 in the ceiling, a few near the mirror etc.
Your house is massive or your castle is very tiny. Either way, that’s an usual amount of lightbulbs.