ohhh do you have the soft one?? I have the working one and no reporting necessary, I have friends here with marriage and retirement visas and yes they have to report every 90 days. I have had my DTV over a year now and have never reported as it is not a requirement, I have left and re-entered the country 3 times, no problem 👍
Visa duration - 5 years, multiple entries from the time I received the visa, there is no minimum time to enter, I have 5 years but obviously you would be wasting the Visa if you didn't use it asap.
Every time I enter I have 180 days, including the first time.
If I cross the border within the 180 days it resets as soon as I come back in, another 180 days, there is no limit on entries for the 5 year period.