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2 or 3 years later is the most popular phrase on the web. 

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• 2 or 3- year-later environment or 2 or 3 years later environment?
• Performing steps 1 and 2 above or Performing the steps 1 and 2 above?
• 7 and later or 7 or later?
• Fig. 2 and 3 display or Fig. 1 and 2 display ?
• 1 to up 2 or 1 to 2 up?
• between 2 and 5 days or between 2 to 5 days?