Never mind. I was asking the question because I was told that when you back-up your database using mysqldump your database is inaccessible while the backup is taking place
hence why I wanted to know for how long my database would be inaccessible
but now I found out that when you use InnoDB with `--single-transaction` and `--lock-tables=false` you can backup/dump your database reliable and consistent without it being down,