God hath removed the restrictions on travel that had been imposed in the Bayán.
The Báb decreed certain restrictions on travel which were to remain in force until the advent of the Promised One of the Bayán, at which time the believers were instructed to set out, even if on foot, to meet Him, since the attainment of His presence was the fruit and purpose of their very existence.

Question: Concerning the limit of fasting for someone travelling on foot.
Answer: The limit is set at two hours. If this is exceeded, it is permissible to break the Fast.