[Konstantinos]

If a player has less than 3600 seconds in total, mod 3 will give 0 so to fix it:

pawn Код:

PlayerInfo[playerid][TotalTime] = (gettime() - gPlayerJoin[playerid]) + PlayerInfo[playerid][TotalTime];

if (PlayerInfo[playerid][TotalTime] >= 3600 && !((PlayerInfo[playerid][TotalTime] / 3600) % 3))
{
    // level up..
}