The realistic version of this is not thirty posts in an afternoon. It is a pattern you can keep, filled from work you have already done, with enough slack that one busy week does not end the whole thing.
Three posts a week is twelve a month. Pick the days and times once, as a weekly pattern, and every later decision becomes which post goes in the next slot.
A shoot, a launch, a week's work — most people have more usable material than posts. Pull from it rather than inventing thirty new ideas.
Writing twelve captions in a row is faster than writing one a day, because you are not reloading the context each time. Override per network only where the register genuinely differs.
A month scheduled solid has nowhere to put the thing that actually happens. Leave a slot a week empty for whatever is timely.
A fully pre-written month reads as pre-written. Mixing in something from that week is what keeps it from sounding like a brochure.
Cheerful automated posts during bad news is the classic scheduling failure. Know how to clear the queue, and check it when something happens.
A month scheduled is a month of data. If you never look at which of the twelve did anything, the next month is the same guess.
Two to four weeks suits most people. Beyond that, enough changes that you end up editing the queue as much as you would have spent writing fresh.
Yes, any time before it publishes. Once a platform has accepted it, changing it is that platform's business rather than ours.
Connect your accounts, upload a video, and publish. Takes less than a minute. Free to start — see plans.