Ask a question, Do you think it worth to practice 8 handed, 7 handed , 5 handed ?

Just like the question.

I do know based on my calculation of maths.
they are slightly different in the way poker should be played.

so my question is, is it worth for practicing.
eg 7 handed play or 5 handed play?

the situation comes from sometimes MTT would not full of players, so table may drop to 8 handed, or 5 haned.

and the money gap between 4th to 5th should be large.

and sometimes the 6 handed table is not 6 max but 5 max or 4 max.

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but I just want to know , anyone calculated, the hours input into practice will get a good positive return?

thanks.