Three minutes. We held the tower without dying for that long and Karthus never came to help. You don't abandon a tower when anyone coming to assist you would have saved it.
Like I'm glad you live in a fairytale world where you it's your fault if your teammates are bad, but your example sucks. The Malz you played with doesn't look like he did so hot. When Malz came bot he was 3-0 and had the highest farm on the map.We had just got done killing someone in bot and were at low health, and we still held out for that long. Karthus never even ulted once in the entire laning phase. It was ridiculous.
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Black Turtle did a pretty good job.