> It is a bad way! If animation?

Yes in case of an animation this isn't a good idea. In case of a still it is the
way to go. As Alain mentioned your problem is with the media settings. The first
example uses an extinction value of 0.01 the second 4.871. The first scene has
30 samples within cube_001 the second 256 and there are some different settings
with the light_sources. These settings causes the prolonged rendering time.
Thomas mentioned problems with bad defined meshes which is true in general, but
not with your simple ones here. You have only a cube and such but not Lucy. I
think he only tried to give you an other hint, what could be got wrong from his
long time experience with POV.

But your problem comes from your settings for the scattering media. May be you
have misunderstood some parametrisations within Blender or there is a bug within
the exporter from Blender to POV. I propose to ask the Blender Community as
well.

Best regards,
Michael

BTW: Your first scene took 7 min 40 sec at my (new) system, the second is at 2%
after 20 min. So I can reproduce your problem. I used the scattering values from
the first scene for the second and yielded rendering times close to the first,
but unfortunatelly another lighting. Excuse me, that I cannot go further into
this issue, since I have my own renderings pending.

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