The installation time is approx.4.0 hours. Installation time is approx. 4.0 hours. If the underfloor battery cable If the battery cable underfloor has to be has to be replaced, the installation time replaced, the is increased by another four hours. If the installation time increases by another 4 hours. If the fan has to be replaced, the installation time fan has to be replaced, the installation time increases is increased by approx.1 hour. by about 1 hour. ***** ***** ***** *****