function duration($time)
{
	if ($time == 0)
		return 'N/A';
	$t = $time / 60;
	if ($t < 1)
		return round($time) . ' seconds';
	$time = $t; $t = $time / 60;
	if ($t < 1)
		return round($time) . ' minutes';
	$time = $t; $t = $time / 24;
	if ($t < 1)
		return round($time) . ' hours';
	$time = $t; $t = $time / 7;
	if ($t < 1)
		return round($time) . ' weeks';
	$time = $t; $t = $time / 52;
	if ($t < 1)
		return round($time) . ' years';
	return "{$time} years";
}



then you can use this to print out the stuff..
<td class="timeplayed <?=$player->timePlayed == 0 ? 'none' : ''?>"><?=duration($player->timePlayed)?></td>
<td class="lastplayed"><?=duration(time() - $player->lastPlayed)?> ago</td>