The phrase "critical time" refers to a very important and crucial moment in an event or situation. It is a time when the outcome or result can greatly depend on the decisions or actions taken. Full definition
Riders can give you the opportunity to extend or continue life insurance coverage, sometimes at critical times for you or your family. (newyorklife.com)
Every teacher knows that there are children in their classes who could benefit from extra help at critical times in their school lives. (politics.co.uk)
She helped me walk through one of the most critical times in my spiritual life. (nakedpastor.com)