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$max_wait   = $wait1 > $wait2 ? $wait1 : $wait2;

$max_wait    = $wait1 if $wait1 > $max_wait;

$max_wait   = ($wait1 > $wait2) ? ($wait1 > $max_wait) ? $wait1 : $max
+_wait : ($wait2 > $max_wait) ? $wait2 : $max_wait;