An intensive course is more like 4-5 weeks, with flying 1/2/3 hours a day, probably in 2x or 3x 1 hour sessions (which people tend to do in the US, but lets not get into the usual pros/cons of that plan here).
Be cautious about trying to do 2 hour lessons - 3 will likely be a non-starter (your instructor will need to pee occasionally!).
When you're first starting out, 2 hour lessons will leave you knackered and overloaded - you likely won't get much value out of the 2nd hour.
2 hour bashes around the circuit likewise will leave you shattered.
If you really wanted to do 2 hours, you'd likely do 1 hour, wait a couple of hours and fly the next hour. You'd likely be better served by doing 1 hour, twice per week, rather than on the same day (would also give you some redundancy as you can expect to have a decent proportion of lessons cancelled due to weather).