Tonnage Question

I currently hold a 50ton near coastal and have enough time to move up to my 100. I have been working part time on a 120ton yacht doing delivery and basic runs on it. I don’t have a license big enough to be a mate since I am only a 100 ton mate. So can I use any of this time towards my next license. How many days to on it to get my 150 or my 200ton. Thank you so much for all the knowledge on this forum I have been using it since I got started but this is my first post. BTW there was a 500ton captain on the boat so I was technically a deckhand.

I borrowed the following from Columbia Pacific Maritime’s web site… Without permission I might ad…I’m sure Dennis will forgive me though…
They explain the lower level license structure very well…Read this and see where you stand…

Licenses as Master or Mate 200 tons or less are issued in 50 ton increments
and with either an inland, near coastal or an ocean route depending on the
qualifying experience of the applicant.

Sea service experience gained under the authority of a Master or Mate 200 tons
or less license can be used to upgrade the license to Master 200 tons, Master
of Fishing Industry Vessels, or to Mate of Towing Vessels.

Tonnage limitations for licenses of less that 200 tons are issued in 50 ton
increments, rounding up, depending on the size of vessels the qualifying
experience of the applicant was on.

A 25 ton limitation will be issued if all the qualifying experience was on
state registered vessels of less than 5 gross tons (GRT).

A 50 ton limitation will be issued if any of the qualifying experience was
on documented vessels of greater than 5 gross tons.

A 100 ton limitation will be issued if either: 50% or more of the
qualifying experience was on documented vessels of greater than 34
gross tons; or 25% or more of the qualifying experience was on
documented vessels of greater than 50 gross tons.

A 150 ton limitation will be issued if either: 50% or more of the
qualifying experience was on documented vessels of greater than 67
gross tons; or 25% or more of the qualifying experience was on
documented vessels of greater than 100 gross tons.

A 200 ton limitation will be issued if either: 50% or more of the
qualifying experience was on documented vessels of greater than 100
gross tons; or 25% or more of the qualifying experience was on
documented vessels of greater than 150 gross tons.

A Mate 200 tons or less license issues the authority to be the Officer in
Charge of a Navigational Watch (OICNW) on any uninspected passenger vessel
or any inspected vessel within the limitations of the license. A license as Mate
does not issue any authority to be the master of any vessel, only to be in
charge of the watch under the authority of a licensed master. This license will
be issued with an inland or near coastal route depending on the qualifying sea
service of the applicant.

A Master 200 tons or less license issues the full authority of the OUPV
license and the additional authority to operate any inspected vessel and any
uninspected passenger vessel within the limitations of the license. This license
will be issued with an inland, near coastal or all oceans route depending on the
qualifying experience of the applicant.

Thanks for the help.