If you are staring your dream in the face and seeing that it is time to quit, I urge you to call the time of death right now. You can sit here with this book in your hand and do it, or climb to a mountaintop and shout it, or write it on a message in a bottle and throw it out to sea. However you do it, do it. I can guarantee that there is life on the other side of the impossible. And naming the time of death is an important process in moving on, letting go, and getting to the other side.

The land will pasture forty cows.

Hand-wrapped puggaree hat-band. Ideal for gardening, hiking or exploring forgotten tombs. -- commercial site with illustration

So, there is considerable evidence in favour of drawing a categorial distinction between the preposition for and the complementiser for: they are different lexical items (i.e. words) belonging to different categories.