See if I under stood your question correctly, you want to know when you are eligible and for how much :-
First Point is Prohibition of Employment :-
Section 4 in The Maternity Benefit Act, 1961
4. Employment of or work by, women prohibited during certain periods.—
(1) No employer shall knowingly employ a woman in any establishment during the six weeks immediately following the day of her delivery, miscarriage or medical termination of pregnancy.
(2) No women shall work in any establishment during the six weeks immediately following the day of her delivery miscarriage or medical termination of pregnancy.
(3) Without prejudice to the provisions of section 6, no pregnant women shall, on a request being made by her in this behalf, be required by her employer to do during the period specified in sub-section (4) any work which is of an arduous nature or which involves long hours of standing, or which in any way is likely to interfere with her pregnancy or the normal development of the foetus, or is likely to cause her miscarriage or otherwise to adversely affect her health.
(4) The period referred to in sub-section (3) shall be—
(a) the period of one month immediately preceding the period of six weeks, before the date of her expected delivery;
(b) any period during the said period of six weeks for which the pregnant woman does not avail of leave of absence under section 6.
Now Second point is Eligibility :-
No woman shall be entitled to maternity benefit unless she has actually worked in an establishment of the employer from whom she claims maternity benefit for a period of not less than one hundred and sixty days in the twelve months immediately preceding the date of her expected delivery: Provided that the qualifying period of one hundred and sixty days aforesaid shall not apply to a woman who has immigrated into the State of Assam and was pregnant at the time of the immigration.
Explanation: -
For the purpose of calculating under this sub-section the days on which a woman has actually worked in the es
tablishment, the days for which she has been laid-off during the period of twelve months immediately preced
ing the date of her expected delivery shall be taken into account.