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Levelling is one of "those issues" that seems to upset people. If you use a portable setup or you set up and tear down regularly, then there is a very good case to check levelling. If you set up the same each time, you save alignment time. I use a portable setup and I make sure when I set it up that the bubble on the built in level sits on the north edge of the circle and the tripod is pointing in the same direction, I am all good as my polar alignment is going to close enough that I can tweak it in about 10 minutes. Note, I actually do not care if my tripod is pointing north or south or if it is actually level, just that is is consistent as possible from session to session. And don't get me started on "rat cages"!!
Malcolm
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