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If we used the 67% screen coverage estimate (it does get to 100% in tunnels, though), that's around 0.67*240*160 = ~25,800 px.
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So, let's do some basic math.
33 MHz 040, at 60 fps, gives us 33,000,000/60 = 550,000 clocks per frame.
At 20 fps, that's 3 frames, which gives us 3*550,000=1,650,000 clocks.
1,650,000/25,800=~64 clocks per pixel.
A brief look at Timing table of 040 reveals that's not much at all and can be easily consumed by a simple Move.
Of course, there's 6 stages and parallel FP execution unit.
But in terms of a brute force, it's not much.
And we still need C2P, and other parts of gameplay, etc...
So, 20 fps might be hard to achieve on 040/33...