the last time i played thief was when gnome was around. i found the max to be near 100% of my thieves. it all depends on how many thieves you have. sometimes you need to send 50% sometimes 100% for max effectiveness in NS. if 3K thieves is needed for max results and one person has 3K thieves and another has 6K thieves one sends 100% and the other send 50%. its all relative.