I'm trying to source multiple R scripts with a short delay in between each one. The 15 R scripts to be 'sourced' all collect data from GA API, transform/clean/analyze the data, then finally push the into their own worksheets within a single Google Sheet. So I'd like to set a wait of 1 minute between each script to make sure I'm not overloading the Google Sheet file.
How can I turn the code (below) into a mini-function where there is a wait time between each source() command?
    source("/code/processed/script1.R")
    source("/code/processed/script1.R")
    source("/code/processed/script1.R")
    ...
    source("/code/processed/script15.R")
Thanks in advance for your help! :)
PS - For context, please note I have my working directory organized in the following hierarchy:
 |-project  
    |-code  
      |-processed  
      |-raw  
    |-data  
      |-processed  
      |-raw  
 
    