Pachkhān Completion
After the paccakkhāna is over, the next day the following sutra can be recited. It is a condensed sutra to end the following vows: (i) Navkarsi (ii) Porisi (iii) Saddha-porisi (iv) Purimaddha (v) Avaddha
(vi) Ayambil (vii) Nivi (viii) Ekalthana (ix) Egasana (x) Biyasana
As a bare minimum, one can break the fast 48 minutes after sunrise or later during the day (porisi {~3 hours after sunrise}, saddha-porisi {~4.5 hours after sunrise}, purimaddha {~6 hours after sunrise} or avaddha {~9 hours after sunrise}) and then choose the appropriate fast one had performed from the list (ayambil, nivi, egasana (1 meal), biyasana (2 meal) whilst reciting the prayer below. Recite 3 Navkar before breaking the fast.
If for any reason one is not able to wait for 48 minutes after sunrise to break the fast, then you can break the fast immediately after sunrise.
Uggae sure namukkāra-sahiam, porisim, saddha-porisim,
sure uggae purimaddha avaddha mutthi-sahiam pachakkhāṇa kiyā
cauvihāra āyambila / nivi / egāsaṇā / biyāsaṇā
pachakkhāṇa kiyā tivihāra
pachakkhāṇa phāsiam, pāliam, sohiam, tiriyam, kittiam, ārāhiam
jam ca na ārāhiam
After 48 minutes from sunrise, (I) had taken the vow of abstaining from 4 types of consumables until the appropriate time to complete the vow for the following penances:
(i) Navkarsi (ii) Porisi (iii) Saddha-porisi (iv) Purimaddha (v) Avaddha
I complete the vow after reciting Navkar Mahamantra with folded fist.
For the following vows, (I) abstained from 3 types of consumables (the fourth being water which was permissible to consume) until the appropriate time to complete the vow:
(i) Ayambil (ii) Nivvi (iii) Egalthana (iv) Ekasana (v) Biyasana
The vows have 6 auspicious feelings:
(i) To diligently follow the right process/procedure to follow the vow at its appropriate time
(ii) To often remember the vow to ensure it is properly completed
(iii) To share the food with Guru / other ascetics and be satsified with what’s left over
(iv) To consume food/water little later even though the exact time to end the vow has been reached
(v) To ensure that at the time of eating/drinking there are no mistakes/flaws, to remember the vow
again
(vi) To ensure that the aforementioned 5 auspicious feelings were followed in completing the vow
May any of the evil deeds / transgressions (karmas) committed by me become fruitless (get destroyed).
References:
1. Prabodh Tika by Param Pujya Panyas BhadrankarVijayji Maharaj & Param Pujya Munishree Kalyanprabhavijayji Maharaj
2. Pratikramana Sutra With Explanation (Part 2) by Muni Nirvana Sagar
3. Internet
I apologise and seek pardon for any unintentional errors in translation of the verses.