5 hours and for anyone with DIY abilities it is not hard enough. It has minimized noise considerably Inspite of not currently being at the proposed distance from the prevailing window. Additionally it is invisible! I have connected pictures and it is tough to see the additional unit! Very proposed https://bespokesecondaryglazingba65420.worldblogged.com/40729138/5-simple-statements-about-thermal-insulation-explained