This depends on how well you're taking care of them, but they should last around 6-8 weeks before they need to be reinstalled. Be sure to sulfate-free shampoos, avoid applying conditioner to your roots. Also remember to be careful when styling and brushing your extensions, and never brush from the root as you'll risk snagging them and potentially damaging your own hair in the process.
Tape Ins are installed by sandwiching each piece between thin sections of your hair. Though tape-ins are quick to install and remove, it's almost impossible to place every piece properly yourself, so we recommend leaving it to the professionals.