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Personally I found running many games at once does not work for me, I have gotten cards when it was 3 or less games at once.

Cards generally drop once every 30 minutes for most people when playing a single game I am unsure if this average stays the same when using multiple games.

I do not believe there is a limit to how many you can obtain in a day since there is a limit already associated to the total amount you can have.

Sources

30 Minute 1

30 Minute 2

No Daily Limit Discussion 1

No Daily Limit Discussion 2

Personally I found running many games at once does not work for me, I have gotten cards when it was 3 or less games at once.

Cards generally drop once every 30 minutes for most people when playing a single game I am unsure if this average stays the same when using multiple games.

I do not believe there is a limit to how many you can obtain in a day since there is a limit already associated to the total amount you can have.

Things to keep in mind

Level 10 you start getting foil cards.

Every 10 levels you increase your chances for booster pack by 20% at 100% it has (doubled)

Sources

30 Minute 1

30 Minute 2

No Daily Limit Discussion 1

No Daily Limit Discussion 2

http://steamcommunity.com/tradingcards/faq/

Personally I found running many games at once does not work for me, I have gotten cards when it was 3 or less games at once.

Cards generally drop once every 30 minutes for most people when playing a single game I am unsure if this average stays the same when using multiple games.

I do not believe there is a limit to how many you can obtain in a day since there is a limit already associated to the total amount you can have.

Sources

http://raidwarning.com/steam-trading-cards-101/

Personally I found running many games at once does not work for me, I have gotten cards when it was 3 or less games at once.

Cards generally drop once every 30 minutes for most people when playing a single game I am unsure if this average stays the same when using multiple games.

I do not believe there is a limit to how many you can obtain in a day since there is a limit already associated to the total amount you can have.

Sources

30 Minute 1

30 Minute 2

No Daily Limit Discussion 1

No Daily Limit Discussion 2

The following guide should help you out. What it does is show you how to tweak your settings so that its not demanding on your computer to run all those games at once.

The following might work I haven't tried it myself but he posted his results.

http://uberpirates.com/forum/topic/1544-steam-how-to-farm-steam-trading-cards/

Note:

Personally I found running many games at once does not work for me, I have gotten cards when it was 3 or less games at once however.

Cards generally drop once every 30 minutes for most people when playing a single game I am unsure if this average stays the same when using multiple games.

Personally I found running many games at once does not work for me, I have gotten cards when it was 3 or less games at once.

Cards generally drop once every 30 minutes for most people when playing a single game I am unsure if this average stays the same when using multiple games.

I do not believe there is a limit to how many you can obtain in a day since there is a limit already associated to the total amount you can have.

Sources

http://raidwarning.com/steam-trading-cards-101/