I want to show you how to get your trading cards fastest.

First, you need to start Idle Master as usual.
then you need to wait around 10 minutes for the first drop (if doesn't drop, it means you already dropped)
then you need to open a second steam game manually, and wait another 10 minute to drop another card. you can turn to windows until waiting.
after the drop, close the second game (don't close idle master)
it goes like this. open second game - wait 10 min - close second game - wait 10 min - open second game.

so you don't need to wait 30-45 min (on cs go, it goes to 2-3 hours some times)

i prefer cs source as second game, because it works every time, i get cards more than 300 like this way.
if you don't have cs source, try something from valve. i don't know why but it doesn't work all the time when i use non-valve game.
also i need to say it's better the second game don't have trading cards. maybe it cause confusion.
last one word about vac ban, it's your fault to play vac games while using idle master. just open the second game, not play.

actually i found this trick myself (maybe you found too) and use this manually open-close for a long time. it's tiring thing to follow after many times, so i want to set this system at night and it works for all night automaticly, morning you get a lot of cards i guess. so i talked to my friend to write a single program for automaticly start a game, and close it and continue the pattern. but it doesn't work all the time. it needs to improve better way, so i don't want to publish the program for now.

also i added the guy who wrote Idle Master for telling him to add this trick for next version of the program.
i hope it works for you all. happy farming.

edit: it seems he reject my friend offer, i hope he read my topic about it. anyone who has him on friendlist, please share this topic with him.