Rework / Security Review of 25 small PHP Scripts - repost

We have round about 25 small PHP Scripts, which are a little bit outdated. They contain MySQL statements and they retrieve variables using GET. We need these scripts to be reviewed / reworked. SQL Statements should be converted to MySQLi. Security mechanisms like state-of-the-art escaping / sql injection protection needs to be put in place. Propper escaping and defaulting of GET values needs to be checked. For a keen programmer no more than 10 - 20 minutes per script should be needed, as they are all similar style. Som most likely a one-day-job... You can start right away, work needs to be finished within one week.