my home tourney structure

[PumaFilaCook]

I was just wondering if this structure would work good?
7 players. 300 in chips. 1/5/25.
I want the game to last around 4-5 hours.
The players I am going to play against are beginners so I figure I should have lower blinds at the start.
blinds go up every 30min.
lvl1(1-2),lvl2(2-4),lvl3(3-6),lvl4(5-10),lvl5(10-20),lvl6(15-30),lvl7(25-50),***can't decide lvls 8-10.
example 1 = lvl8(30-60),lvl9(40-80),lvl10(50-100)
example 2 = lvl8(50-100),lvl9(75-150)
the second example seems like the blinds go up too fast considering there are only 7ppl. what do you guys think would work best? Or do you have any other suggestions? Thanks.