SQL Server Scheduling

Hi all, 

I currently have SQL server jobs running in schedule every 20 minutes daily between 07:00 and 18:00, as the source files that get generated can get loaded into the server at anytime depending on when the main data loads occur.

We are now having more work loaded onto the server and the front end access is having more issues due to the scheduling of jobs running. 

Does anyone know if there would be a way in order to kick the jobs off only once all files are in and run once or for the schedule to stop once it has ran after all files are in?

Any help would be appreciated

Thanks

P