System Design Interview, System Design Concepts, System Design, Design Tinyurl, Design Bitly.
number of unique URLs needed for a significant period. A common approach is to plan for at least a few years of operation. For simplicity, let's calculate for 10 years. Seconds in a Year: Seconds in a year: 60 seconds/minute × 60 minutes/hour × 24 hours/day × 365 days/year = 31.536 million seconds