Use find with mtime to search a set number of days
find -type f -mtime -10
where -10 is the amount of time (days) to search.
eg, find all files modified within 2 days
find -type f -mtime -2
Use find with mmin to search for files modified within a set number of minutes
find -type f -mmin -10
where -10 is the amount of time (minutes) to search.
eg, find all files modified within 90 minutes
find -type f -mmin -90
As this is the find command it will search within the current directory and subsequent sub directories
