The PASS is a plan you write up, usually using Social Security's form, and usually with help from a counselor or advocate, which says what your work goal is, what you  need to do and buy to achieve it, how long that will take, and what it will cost. The work goal can be anything, part or full time, at or away from home, working for wages or starting your own business; that you can convince Social Security is something that you could realistically expect to accomplish, and will generate
adequate income for you.

The things you need to buy must be related to the goal - training or tuition, a car or van for transportation, a computer or tools and supplies of your trade or business, day care for a child while you work or attend school, adaptive technology, etc.

The length of time the PASS will take will depend on your plan, what you need, and the amount of money you have available to put in a PASS.  Thanks to an Act of Congress in 1995, there is no arbi/trary time limit for a PASS.

The PASS lets you put income which would otherwise reduce, eliminate, or make you ineligible for an SSI check, such as part or all of an SSDI or RDSI check, or wages; into a separate bank account to be spent for the things you need to go to work that are written into the plan. So you can see that the amount of money that goes into the PASS depends on how much of this kind of income you have available
to put in it.

After you put this money, into the PASS, you are given SSI, or more SSI than you had, to live on.

After you write the PASS, you submit it, with supporting documentation, to the PASS reviewers in your region.  A PASS must be approved by Social Security before it is in effect.

In addition to enabling an individual to become SSI eligible by sheltering income in a PASS, the  individual also becomes Medicaid eligible, because Medicaid goes with SSI..Two other statutes, important to return to work issues, the 1619 (a) and 1619(b)
Statutes, were legislated in 1987. Translated from jargon to English,

1619(a) says: You get an SSI check, so you also het Medicaid.

1619(b) says: You are earning too much money to get an SSI check, but you will  continue to get Medicaid, and remain SSI eligible.