Looking on the internet deeply has found these results:

for the last few days is the most popular phrase on the web. 

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• the past days or these past days?
• Doing nothing for the past few days or Doing nothing from the past few days?
• last few days or past few days?
• Since past few days or For past few days?
• In the past few days or On the past few days ?
• these past few days or the past few days?