1) but how much time take to be dry the film ?
Depends on the conditions in the room; anything from about an hour up to several hours. You have several options:
* Open a nice bottle of wine and enjoy quality time with your friend as your film dries
* Leave the film there and come back for it the next day
* Do what
@MattKing suggests (but be careful, wet film is fragile)
* Develop your film at home
2) immediately after it is dry i would like to cut and carry with me in more confortble way, using a binder. but at the same time i don't want to risk to place the film in the binder that is not completly dry.
So don't cut and sleeve the film while it's not completely dry. Simple. Pro-tip: if you hang film to dry, it's usually the bit at the very end, at the bottom, that's the last to dry. If the emulsion in the center of the film (so between the sprocket holes) is still a little tacky, the film isn't dry yet.
3)we have some weights, but is there any addiced weight to buy for example on aliexpress ?
I use clothes pins, clamps from the hardware store or whatever is available. Don't overthink it.
Also, while weights on the film will help a little, it's not a guarantee that all the curl will be gone.
If you store your negatives in sleeves and put a weight on top, they generally flatten out in a matter of days or weeks.
A little curl doesn't hurt.
Don't worry about it.
4) in what proportion do I cut a roll of film?
Depending on storage and any processing; I generally cut in strips of 6 frames. Some prefer 4 or 5. Strips of 5 frames can be assembled onto a single sheet of 8x10" paper for contact printing, apparently. If that matters to you.
5)To avoid stains, when I hang it up, can I use a microfiber cloth or specific microfiber clips that don't scratch to help with drying and remove any water residue?
Yes, read any of the links I posted earlier for various strategies for avoiding drying marks.
