Great advice there from all. I’m sure my machine can handle the long cut times. As can my dust extraction with a bit of input. (Twin motor, can run each motor for 2 hour stints).

I like the idea of using bigger bits for smoother finish on the open areas.

I did a small piece last night in oak. 150x250mm. Roughing pass and then used a 0.75 radius bit single pass. Really surprised at the results. Will post a photo tomorrow. Total cut time 3 hours. I can see now how bigger pieces can take days. But I feel very much inclined to have a bash. You’re not a proper cnc er if you’ve not done a 24hour+ cut in my book 😉