There are five levels in the Google Foobar challenge. Each level has a different time limit, as described below.
Level 1: 1 Question - 48 hours/2 days
Level 2: 2 Questions - 72 hours/3 days per question
Level 3: 3 Questions - 96 hours/4 days to 7 days (depending on the type of question) per question
Level 4: 2 Questions - 2 weeks for each question
Level 5: 1 Question - 22 days