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it is do able, I had a ground of 14 before, I normally run games with a group of 8.
one options for doing this make up your own story but take maps and encounters from pre made adventures. this will speed things up for you.
ignore XP for leveling just level the group when you adventure says they should be x level.
double the size of the rooms in each map. if it says the room is 50 by 50 make it 100 by 100 this give more room for players and creatures to move around.
Ignore difficulty, make the game easier, it will be easier on them and you. this can be done by making all characters 25 point by or doing the add give them max hp per level.
Creatures since you have a huge party increase the numbers double, but reduce their hp, by 1/3, this will make the game go faster with the large group and make all the pc feel powerful. as they will all have a creature to target or help out with and defeat them quickly allowing everyone to get a turn. only make boss battle challenging. double the number of boss creatures max out hp on them.
remove complex unneeded rules like AOO even the ones from reach ones, they slow things down, charging, mounted rules and mounts abilities to attack.
treat mounts as a speed increase to the player only.
ect. and explain to the players since the group is so large you are cutting out some of the rules and features to speed up play and so they all enjoy it.
let them do crazy stuff that is not in the rules. don't even worry about if there is a rule about it, or a roll. Say rouge wants to jump off a hill and stab some one in, let them do it and give him sneak attack for it don't even bother with the acrobatic check.
basically don't get hung up on rules are trying to make it difficult, but be fair and consistence in any rulings you need to make.