It is enough time to to have a basic understanding of the principles, If my sensei and his sensei and other videos are doing the same then its pretty much standard.
There is rigidity in all Japanese martial arts, its stiff, and square compared to Chinese internal arts. I think it is due to cultural differences and thinking which influcences the approach of martial arts. Chinese arts are like bamboo Japanese arts are like oak tree.
If it is stopping the opponents strike from moving it is a block.
Block(verb)
"make the movement or flow in (a passage, pipe, road, etc.) difficult or impossible."
Blocking (martial arts) - Wikipedia, the free encyclopedia
In Baguazhang we do not do this type of movment when someone strikes us because it prevents flowing,
I may parry
: to turn aside an opponent's weapon or blow. to evade.
I have also visited a Kyokushin school and again they block hard preventing the opponents arm from moving.
In Chinese internal arts we may hit the arm but we do not stop the opponents movment because we attach to it listening to his next movement as we start to apply ours.
I am sure this could be said for most arts as you advance in them.
Here is the differences