Maybe take a look at this topic: [HOW TO] Plan and setup your Zigbee network
It says that the maximum number of devices/routers directly connected to Homey is 64. But I don’t know if this is correct.
However, it’s also quite possible that routers don’t connect directly to the HP23, but via another router. So in theory it shouldn’t be a problem.
But switching many devices at the same time can be a problem, as @robertklep already mentioned.
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