There are 28 floors +1 to beat Mew.
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29, and mew is on the 30th
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You get the places after you rescue the Pokemon frostlass froze on blizzard island and getting the secret rank, then on random days the Pokemon that give you the jobs will give you jobs that tell you to get the seven treasures, one at each place. (mt. avalanche (20 floors), giant volcano (20 floors), mystery jungle (30 floors), bottomless sea (50 floors),shimmer dessert ( 40 floors), world abyss ((50 floors),and sky stairway. (50 floors ) then search "what to do after the seven treasures on Pokemon mystery dungeon.
There are 10 floors to go through on Mt. Thunder. That take you to Mt. Thunder peak, which has 3 floors.
about 30 floors 25 to get to Sky tower Mid 9 to get to the peak(there is a massive change of Pokemon when going up the peak)