[Jason`]

Eu normalmente faria com gettime();

pawn Код:

new canSpeak[MAX_PLAYERS],
    floodCount[MAX_PLAYERS];

public OnPlayerText(playerid, text[])
{
    if(gettime() >= canSpeak[playerid] && canSpeak[playerid] > 0)
        canSpeak[playerid] = 0;
    else
    {
        floodCount[playerid]++;
        if(floodCount[playerid] == 3)
            Kick(playerid);
    }
    canSpeak[playerid] = gettime() + 3;
    return 1;
}

Nem testei, caso for usar e aponte erros, avise-me.