Short answer: Yes.

• What is Chauvihār: It is a vow to take no food and no water after sunset until the next sunrise. It concerns only the night.

• Next morning: Chauvihār does not bind you to take Navkārsi (first intake 48 minutes after sunrise). The next day you may:

• take Navkārsi, or • take Porsi/Sādh‑porsi (a later meal time), or • continue fasting (e.g., upavās/atele), according to the pachchakkhān (intention/vow) you have taken.

• Traditions:

• Shvetāmbara: Navkārsi is the preferred first intake, but it is not a compulsory follow‑on to Chauvihār. • Digambara: The principle is the same—no food or water after sunset; next day’s first intake is as per one’s vow and discipline, not obligatorily Navkārsi.

• Good practice: Decide and take pachchakkhān clearly (from a guru/elder or as per your daily niyam), keep purity of time, and consider health.