Use 1/ISO with sunny-16 rule.
With f/16 and ISO 60, this gives 1/60 for a "normal" exposure.
6 stop ND means a 1 second exposure at ISO 60 with sunny conditions. Is this shutter speed slow enough to achieve your goals? If not, use the slowest ISO your camera can achieve, and close the lens down beyond f/16 if it is capable.
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