a little reminder: writers are people too.
i think people often forget that writers deal with all kinds of things; personal issues, writer's block, their own perfectionist tendencies, hateful anons, self-doubt, etc. and while they would love to finish a request or their own fic within a few hours, a day or so, sometimes that isn't possible. demanding, rushing or making a writer feel guilty for not adhering to your schedule or preference to how and when you think a writer should complete a fic or a request is quite unfair. believe me, they are most likely already stressing out about writing and posting as fast as they can.
if you want quality fics, then it will take as long as it takes to get them written. remember, you are getting free fics of your favourite characters. by all means, check-in and ask about your request or any upcoming/posted fics they have. writers always love to talk about their work. but please be mindful that a writer needs time to complete a fic/request. especially, if they have quite a lot of requests to write (and they may not necessarily write in the order the requests were sent as inspiration strikes when it strikes). and if they can't complete your request for whatever reason, they'll let you know (truthfully, a writer isn't obligated to complete every request if it triggers them, if they have lost inspiration or if life simply gets too much and they need a break).
also, if you get tired of waiting for whatever reason - although, you really shouldn't considering you are getting free content and a lot of love is being poured into giving you said content - and want to go to another writer to request the same story, then please, tell the first writer you asked that you have requested someone else to write it so they don't waste their time stressing over getting it finished.
writers will always give their all to any piece of writing. all that they ask for is patience, understanding, feedback, encouragement and support. which is a very small "payment" to make compared to how much time, effort and love they pour into every fic.