One other things I've been noticing is that it gets stuck on the fountain quite a few times. I'm not sure what happens if you leave it there since I've been at my computer most of the time. Other than that great script!
Edit: Progress report

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[ Kings Varrock West Massacre ]
[ Version .98 ]
[ Progress Report ]
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[ Worked for 34 Minutes and 34 Seconds ]
[ Banked 30 loads! ]
[ Softened 364 clay! ]
[ Softened 632 clay/hour! ]
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[ Individual Report's ]
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[ [#][Nick] | Active | Banked | Softened | Location ]
[ [0][igg ] Active: False B: 3 Soft: 28 Loc: Fountain ]
[ [1][ono ] Active: False B: 11 Soft: 140 Loc: Fountain ]
[ [2][ega ] Active: False B: 13 Soft: 168 Loc: Fountain ]
[ [3][ieg ] Active: True B: 3 Soft: 28 Loc: Fountain ]
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Not sure why but I can never seem to get more than 30 minutes.