Envirmental monitoring

How many days require to be monitored for envirmental monitoring (Viable and Nonviable ) for sterile and non sterile new facility.

[quote=mahesh patel]How many days require to be monitored for envirmental monitoring (Viable and Nonviable ) for sterile and non sterile new facility.[/quote] Monitoring never stops

21 days minimum daily monitoring is required to validate the clean room.then after u can give frequency

why we need to monitor minimum 21 days for environmental monitoring .which guideline tells about it.