It changes constantly.
Typically (i.e. not every time), the boat will get 6 months, especially if you slip 1,000baht under the table.
Personal visas - make sure that you check everyone in as passengers, if they are checked in as crew they will need to leave the country on the boat and will be required to post a bond to ensure that they do (20,000baht each - maybe more now - this also changes with the wind). Skipper
will need to post a bond.
Visas are valid for 30 days and can be renewed 3 times, either by sailing back to Langkawi or taking the scariest bus ride of your life to Burma. After you return from Burma, you have entered as a tourist and can then get your bond back. After 3 renews, you need another type of visa that is valid for another 3 months and is not available close by - you will need to take a flight to Malaysia
. After six months you must leave and remain out of the country for 6 months min.
If you are leaving the boat - I would suggest Rebak Marina, Langkawi. If you are getting work done on the boat, I would also suggest anywhere other than Phuket. Phuket is the most expensive place to have boatwork done in SE Asia
- by about a factor of 3.