I plan to travel to Tibet for a week.

As shown above, this sentence has been broken down into several parts that express the basic meaning, so it can't be broken down any more, so there should be eight morphemes.

I think what you are confused about is whether "one" should be used as a morpheme or divided into "one" and "one".

I think "one" is composed of the numeral "one" and the quantifier "ge". The separation or combination of these two words does not affect their own normalization, so it is necessary to separate them.