Sincerely thank you for the answer, AlpheccaStars.
If I may ask you one more, could I know why "I think it will take more of 30 minutes than on other weekdays." is wrong? Of course, I feel something weird a bit in there, but that expressions feels a bit right.
We commonly say, for example, "two of the people", so I thought this form can go along with "more" and "30 minute