If you have already Online Permit or E-Permit, you can enter into Bhutan through Phuentsholing gate even on Saturday or Sunday. The Biometric office is generally open seven days a week from 9 am to 9 pm for the Online Permit Tourists. But if you want to do offline permit, Saturday, Sunday and Bhutan National Holiday Permit office is closed and hence you can’t enter into Bhutan through Phuentsholing on Saturday /Sunday or Bhutan National Holidays.