A Button pressed just for 250MS in a game

[BrightLeaN]

I Cant get it work
Hello, so i decided to make a "Auto Farm" AHK for a game i want it to press the Button A but only for 250 (sleep) i only know the "command" {a down} but i want that it just goes for 250ms but i want that if the AHK walked to the left ( A Button ) that it types {T}{/}sell all and then it repeats 10 Times i hope i can get some help how to make a Button pressed for 250ms not forever Answer in german or english
when i do Send a nothing happend in the game but why ? im a newbie :d
{
F::
{
send a
send {a down} {T}{/}sell all
}

return
}

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[neomulemi6]

Both should produce the same result. Pick your poison.

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Send {a down}
Sleep 250
Send {a up}

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SetKeyDelay, 0, 250
Send a