Great answers.
More practical is the one to calculate speed (desired fps ÷ original fps) However I would like to state that I had to set the desired fps (18) to BOTH the project settings and at the time of exporting to get the perfect gif i.e. Exact number of frames as the total of the timeline (no dublication) + running at a slower framerate (18).
So based on what Austin said, this seems to be the steps to slow down or speed up a gif w/o duplication or deletion of frames.
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Choose an appropriate lower or higher framerate depending on what you want to do.
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This is the desired fps. Divide it by original fps of the clip. Put this value as the speed in i/properties of the clip.
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Use the desired fps as the project fps and also while exporting.
Another thing - at a point in trial n error I made a slowed gif with twice the number of frames (duplication) however I saw that the file size was almost same as a neutral gif export at same quality setting.
Can you tell how is that possible?
Are there instructions to use frames twice rather than actually storing them?
Is this kind of gif stable when copying or moving.
Lastly I understand that making gif is not the main purpose but when I saw that it can export much more detailed (but heavy) gifs I wanted to see what all it could do so I asked in more details.
Thanks again Elusien and Austin