ولا يسقط بضيق الوقت وعدم الماء واللباس ونحوه
The duty does not simply disappear because time is short or water or clothing is lacking.
A narrow time window is a limitation on available time, not automatically a removal of legal responsibility. How one is to act under actual constraints is determined by the relevant rules of performance and capacity.
Three issues must be kept separate: whether the obligation exists, the person's capacity, and the legally valid mode of performance. Difficulty in one does not automatically settle the others.