Confused about timings when moving swarms

[Millet]

Cool!

What size hole is that? 'Drill' diameter?

I was looking at the various flat wood bits in B&Q but couldn't decide.

Tom Seeley would say 32mm... what say you?


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The drill bit i used is 25mm Joseph, and the length of the tunnel into the Nuc is 50mm which slopes slightly down to help stop any water from rain running inside.