To add to what Steve said, remember the reasons for the quarantine tank:
To give fish time to continue to de-stress from the many trips they had to take to get to your tank.
For you to see that no parasites or other signs of disease develop before you add it to the display tank
The life cycle of these parasites or signs of disease will typically show up within the first two weeks, so while your fish may appear healthy the first couple of days, you want to be sure that they stay healthy and eating throughout the quarantine period
Minimum recommended period is two weeks. Some folks keep them in QT for 4 weeks, but I would not recommend any less than two.
Remember while this may be your first fish, it will not be the only one. You want to take every precaution to protect your livestock (and investment) as you add more fish in the tank. That means using every reasonable effort to minimize the risk of adding disease or parasites in your display tank.
Ultimately you will decide what you are comfortable with, the only advice I can give you is to be patient. The consequences is not worth the risk. HTH