How long is 1 era Astar?

Could you elaborate on the duration of 1 era in the context of Astar? As a professional in the field of cryptocurrency and finance, I'm aware that blockchain protocols often utilize various time frames to structure their consensus mechanisms and transaction processing. However, the specific length of an era in Astar's ecosystem is not immediately apparent to me. Is it measured in seconds, minutes, hours, or days? How does it relate to the overall network's performance and scalability? Additionally, are there any factors that can influence the duration of an era in Astar, such as network congestion or the number of validators participating? I'd appreciate a concise yet thorough explanation to gain a better understanding of this aspect of Astar's operations.