90 days is safe limit as advised by lawyers. In some countries you can stay much longer without incurring any tax implications, however, as a company you want t

90 days is safe limit as advised by lawyers. In some countries you can stay much longer without incurring any tax implications, however, as a company you want to avoid your staff getting into legal difficulties if they stay overstay by one day for whatever reason (oversight, delayed flight, etc). Very few staff tend to take 90 days in one chunk. It is often used for 4-6 weeks to either visit family, or have a working holiday in a tropical holiday location. Timezones can be an issue for some job roles, however, you can ask staff to mostly keep working according their original timezone if there is a time critical element to their job role. However, in most cases it is actually great to have someone working either earlier or later than the rest of your staff. It reduces the window for out of hours support.