As per doctors, you can comfortably wear contacts at a stretch f 14 to 16 hours. However, it is best not to push it until the last hour. After a workday, you can always come home and remove your contacts, refresh them and then put them back after an hour or so. Another good thing is to dispose of them off and wear them the next day. However, it can be difficult for those with a high number to continue for long without wearing lenses. The best way is to take breaks as much as you can. This way, you don’t end up getting used to the lenses and worry about pushing them to the last hour of safety.