[LarzI]

https://sampforum.blast.hk/showthread.php?tid=55261 - Read this.

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Now to your problem.
Simply use SetTimerEx:

pawn Code:

SetTimerEx("muteTimer", 60*1000, false, "i", playerid); //60*1000 = 1 minute

Then make your timer callback:

pawn Code:

forward muteTimer(playerid);
public muteTimer(playerid)
{
    muted[playerid] = 0;
    return SendClientMessage(playerid, 0x00FF0000, "You are no longer muted.");
}