Sea time help upgrading from 500 master to 1600

Hi I am getting ready to renew my ticket. As of late i have been sailing as mate on a 106 ft yacht which is a 105 tons I have 1 yra sea time on it. . I belive from what i have always understood is that to up grade one must be a master ,mate or in a supervisory position and it can be also 12 hr under way days for 1.5 sea days… am I correct. oh yea my ticket is a 500 oceans with a master of tow.



Especially with regards to the 1.5 for 12 hour day