Apples to Apples Jr., TransAmerica and Carcassonne Hunters & Gatherers all seem like good candidates from your list. I have a hard time imagining finishing Ticket to Ride or San Juan in that amount of time, but maybe my game group is just slow. I haven't played any of the other games suggested.

Games that I would suggest looking into are The Great Dalmuti and Guillotine, both of which are back in print and available at Rainy Day Games.

Niagara can tend to be long as well (in my experiences).

Other possible additions and games that have worked well at my school:

No Thanks
Pick Picknic
Villa Palleti
Jungle Jam
Pounce
Gold Digger
Gulo Gulo (might seem too young, but my 3rd and 4th graders love it)
Loot! (high recommendation on this one)

I will be interested in hearing how it goes! Good luck.

How about...
Sabatour
PIT (If your not playing in the library...)

You may want to check out a new game we created for the classroom and home play. It's Pitch-A-Story! and you can have up to 18 playing at any one time, and can be played in the 50 minute time frame.

Kids and adults are discovering that the PITCH-A-STORY! board game is one of the most exciting and entertaining games to hit the market. The game takes players into the exciting world of entertainment where storytelling is king. Just like writers and producers pitch stories for movies, TV, Broadway, and best selling novels, players are challenged to create inventive and entertaining tales.

It’s also a fun language art tool for ages 10 through college, improving reading, writing, presentation and theatrical skills. It includes the “Story Invention Guide” for teachers, home schooling parents and youth leaders with suggestions for hours of learning activities to enhance students’ literacy and creativity. Here’s what one teacher said about the game: “Ordinarily, if a game doesn’t have a bell, a whistle, or an electric cord coming out of it, kids don’t know what to do with it. They never once asked me: Where do you plug it in?”

The game has also been receiving a good deal of recognition. It has won the Dr. Toy Smart Play Smart Toy Product of Excellence, Creative Child Magazine Seal of Excellence, and the Canadian Toy Testing Council 3-Star award.

I'd be happy to send a game to you for review. To learn more about the game, please visit our website www.pitchastory.com. In the left menu bar there's a button that will allow to actually see the game being played.

Thanks.

At that age, my three girls gravitated to:

Igel Argern
Bazaar
A Dog's Life

Ken

My 3rd grader really likes Top Secret Spies. It's a quick game that easily encompasses a variety of age groups.

Here are some other suggestions, Chris:

Bohnanza - Surprised you didn't include this. Younger kids usually have no trouble figuring it out and it's always great fun.

Geschenkt/No Thanks - Ultra-simple rules and great gameplay. The perfect filler.

Tonga Bonga - If you can find a copy, Tonga Bonga is a great family game. It also uses a rudimentary economic subsystem that gives kids some interesting choices of influencing the other players.

Around the World in 80 Days - A little more fiddly than TtR, but still a good choice with a fun theme. Nice mix of luck and skill.

Careers - An American classic that's much better than it's usually given credit for. You might want to lower the success formula total to get this within your time limit.

Get the Goods/Reibach & Co. - Wonderfully simple card game with plenty of scope for skill. Plays nice and fast.

Hare & Tortoise - Great painless way of teaching math and an excellent game as well.

Trendy/Crazy Race - Fun game of anticipating other players' actions. Crazy Race's theme might be more acceptable to the boys in the class.

Warriors - A card game version of Risk that's quicker and allows for more skill.

Ice Cream - A solid filler with simple mechanics and a popular theme.

Clue - Kids often do surprisingly well at deduction games. If you let them teleport from room to room, you should be able to easily fit this in the time frame. An alternative (and an even better game) is Clue: The Card Game.

Vampire - A good rummy-type game, and everybody loves the slightly gory vampire illustrations.

Hope these help. Good luck!

Since someone else broke the ice first by "pitching" their game, might I suggest 24/7 the Game (when it is released, of course). It is fairly easy to learn and it plays in about 25 minutes, so you have time for two games. It is also good way to reinforce basic math skills.

Have fun!

-Carey