I am the master of FF7

[Omnipotent Archmage]

cool, i,m impressed...

ok, how many different monsters exist in the gold saucer battle arena?

There are fifty-three in the post-Highwind arrangement and the Special Battle. I haven't yet gotten the monsters for the other arrangements. If you care, the monsters are Razor Weed, Garuda, Dual Horn, Bizarre Bug, Jayjujayme, Foulander, Tonadu, Tail Vault, Slaps, Under Lizard, Kelzmelzer, Adamantaimai, 8-Eye, Jemnezmy, Toxic Frog, Doorbull, Ancient Dragon, Jumping, Ice Golem, Acrophies, Hippogriff, Vlakorados, Trickplay, Boundfat, Malldancer, Magnade, Snow, Lessaloploth, Shred, Frozen Nail, Headbomber, Evilhead, Cuahl, Zolokalter, Stilva, Tonberry, Dragon Rider, Gremlin, Malboro, Blue Dragon, Gigas, Wind Wing, Ironite, Ghost Ship, Ho-chu, Sea Worm, Serpent, Unknown 3, Wolfmeister, Behemoth, Maximum Kimaira, Proud Clod, Jamar Armour.

how long did it take u to master all your materia 7 times (4 the 7 lots of master materia u require 4 every character after u get 1 lot for killing the emerald weapon) and master all characters stats?

i,ve been playing 4 about 300+ hours and i,m still not done.

I don't time myself. All I know is that it took well over a hundred hours.