You can, but they'll probably refuse if they're being professional.
Human beings just don't learn that continuously and intensively - I didn't, you won't, nor just about anybody else. You need to be fresh enough to learn at the time, and you need time for briefing and debriefing - not to mention for it all to sink in between lessons.
More advanced students may go up to 3-4 hours per day: I occasionally did when doing my CPL, but I had 1000ish hours at that point. Somebody with less than 100 hours, as well as a fair bit of flying recency, in my experience, just can't absorb the learning beyond a couple of hours, separated, per day. They can fly - but anything past about 45 minutes airborne per lesson is mostly just wasted money on an inexperienced pilot.
G