This is such a personal thing... How tall are you, how are your body proportions, long/short legs, arms... etc. etc.
For example: I am 6 ft., my weight is about 170 lbs. Last year we drove in 2 days about 950 miles. Of course with (short) stops every 2/3 hours. And since you have to go back home after holidays
this happened twice
The driver seat of the Jazz (ours is a CVT) is the first one that does not cause any problem for me
at such distances.
Does it mean that the Jazz has the perfect seats? Of course not. For me: yes! For you it can be this or that. Perfect or disastrous (and everything in between).
You want to be sure?
Rent a Jazz for one day (or maybe one weekend) and
try!