How Long Will It Take to Close a Gap Between Teeth of About 0,06 Inch (1,5 Mm)?

You have several options for closing a gap between two front teeth. 1) orthodontics (conventional or Invisalign). This would not take long at all assuming the rest of your teeth are in perfect alignment. Probably six months or less. However, you will have to deal with retention for the rest of your life or the space will reopen.  2) Porcelain veneers. This is a two step process where the teeth are first prepared, an impression is taken and the second appointment where the veneers are cemented into place.  3) Composite bonding is the least expensive and quickest way to fix the problem. It is done in a single visit.

Good luck!

Thank you for a great question.Invisalign moves teeth .25mm for each aligner. Assuming your case will permit 1 week aligner wear, it should not take more then 6 weeks to close gap between 2 teeth.The question should be asked though why is there such a big gap on the first place? What prevented teeth to have no space? If the reason for the space is gone, no problem, it will close smoothly. On the other hand, if the cause for the space is still there (like extra tissue between teeth), you might want to address that as well.

Invisalign is a great option to close gaps. If you only have the 1.5mm gap in your front teeth and everything else is perfect, you would probably need the aligners for only about 3 months. 
Warm Regards