My personal minimum line length is about 300ft (90m), and I like nylon 3 strand for its stretchy characteristics, and ability to be easily spliced. Currently I have 375ft (115m) of 1/2in (13mm) line, with 25ft (7.6m) of 1/4" (6mm) G43 chain, connected to a Mantus 13lb (6kg) anchor. This setup is good for a heavier 20ft+ (6m+) boat, and leaving it unattended while scuba diving knowing the boat will still be there upon return (Yeah yeah life is risky).
This is another option for line to chain attachment. One less screw to come loose, nor pokies on hands from tie wire holding the shackle screw.