Yes, it's a good idea to use that mode if you don't want your friends from getting endless notifications whilst using fast mode setting to get the card drops.

引用自 Daft：

So if you do it once in your whole life, you can't farm before 3 hours?

Correct.
Only old accounts get drops in under an hour, newer accounts have to wait 2 or 3 hours.

Sorry I don't see how, Steam does this.

That's down to Steam being annoying. Log out all other instances of steam from browsers etc to reduce the chance of this happening.

If your IP address changes it could happen too.

That happens if you refunded a game.

Get latest version IM extended:
https://github.com/JonasNilson/idle_master_extended/releases


And:
2. Delete Idle Master's Application Data (this usually fixes can't log-in problem)

https://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/133257636766989675/

Tuesday night is Steam maintenance time, try again.
Use IM extended latest but turn off quick login.

SAM is steam achievement manager and has nothing to do with card drops.

IM just tells steam a game is playing, why would steam ban you for playing a game?

Create a shortcut to steam-idle.exe,
Right click it, change the properties of the shortcut
Add the AppId of the game you want to idle to the end of the target line

Or run steam-idle.exe from the command line with the appid on the end

You can get the appid from the steam store url of the game in question.

Note: if you've had all of the card drop for a game then running the game further will not give additional card drops, steam gives you roughly half a badge once per game per account (excludes free games).

Turn off quick login