Can I restrict invited user to operate during specific time?

Yes, you can always schedule the invited user and limit their access. You  may schedule them from SmartEntry app or portal. 

To schedule from SmartEntry App,

• Open SmartEntry App and go to User Management from bottom
• Select the user from screen
• Select SmartEntry device from list for which you want to schedule user
• You will see check mark for user devices which user has
• Tap on edit icon on user devices
• Tap on clock icon to edit the schedule

To schedule from SmartEntry Portal,

• Login to portal
• Go to Users from top menu
• Select user from the list
• Select Access Type and modify the schedule