A useful working window is this: a page often shows some initial movement within a few weeks but can take several months to reach its real position, and on a newer domain the slower end is the norm. Treat that as a range, not a deadline. The key is to separate the early signal, any sign Google has found and started placing the page, from the final position, where it actually settles. A page that is going to rank usually shows life early even if it climbs slowly afterward.
The early signal matters because it tells you the page is in the game. Within the first few weeks you are typically watching for the page to get indexed and to start appearing somewhere for its target terms, even if that is page three or five. That early placement is Google trying the page out, not its verdict. The final position then develops over the following weeks and months as more signals accumulate, the domain’s trust is factored in, and the page is re-evaluated against competitors. A new page climbing gradually over months is behaving normally, not failing.
What turns the window into a diagnostic tool is sustained total absence. If the page is going to rank, you expect at least some appearance, somewhere, within the window. When weeks pass and the page is registering nothing at all, not indexed, not appearing for anything, that prolonged silence becomes a signal worth acting on, because it suggests a discovery, indexing, or relevance problem rather than ordinary slow settling. Partial early movement that is just slow is patience; complete absence past the window is a flag. Exact timelines vary by site and query, so keep this as a working range to confirm against your own data.
So set a window appropriate to your domain’s age, a few weeks for early signs, longer for final position, and watch for any movement at all. If there is some, give it time to settle. If there is none after the window, stop waiting and diagnose indexing and relevance, because continued patience will not fix a page Google never picked up.