[Q] I have a Amiga 3000/25. How long should it take to do a full trace picture with perhaps one transparent (nearly) glass? Does 4.5 hours sound reasonable to you? I am running the floating Point version of Imagine.
The floating point version of Imagine uses inline floating point code for maximum speed. It does not use the libraries. I suspect that the non-FP version uses the libraries, just in case. You can probably SPEED UP your trace time SIGNIFICANTLY by scaling up the whole scene in the stage editor (see question 4 above!). A trace time of 4.5 hours on a 3000/25 definitely a "wee bit" on the high side for a scene as simple as you describe.