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this is picture of strop with white paste. let me mention white dovo i bought it long time ago from classic shaving.

yes it does speed up the process a lot.you don't need more then 15 .i have never done more then 10.

answer to your question eventually you will need to go lower grit and set bevel and hone blade. Now how long time no one know.
i do approximately 10-15 passes no more then that then i clean edge of...

i have used it almost 4 years. it is ok use it . if you like picture of it let me know. i will post.