Simulating Long Exposure in Photoshop

How to Simulate Long Exposure in Photoshop by stacking multiple exposures

Take multiple photos
Import in lightroom
Batch process the photos
Right click and select open as layers in photoshop
Calculate shutter speed by number of images by shutter speed used
Calculate ISO by dividing the number of images by ISO used
In photoshop select all the layers
In edit menu click auto align layers
Select layer menu and select Smart Objects and convert to smart object
Select layer menu and select Smart Objects and select stack mode and select mean

Good bye ND filters!