Open the launch under "Launches" → "History" — its status and journal show what it's waiting for.
- "queued" — launches run in order, oldest first. Yours starts when its turn comes.
- A "Facebook limits" line in the journal — Facebook asked to slow down. Not an error: the launch waits the time Facebook names (2 hours at most) and carries on by itself. From 75% load each write gets a short pause.
- A user token — the profile pace: at most 4 ads per 30 minutes, at least 2.5 minutes apart. 20 ads on one profile take over two hours.
- A big structure: up to 200 objects per account, times the number of accounts.
- A start "At midnight in the account's time" or "At a set time" — objects are created now, delivery starts later. That's not a slow launch.
Don't launch the same preset again while the first launch is running — you'll get duplicates. If it failed — "Retry" picks up where it stopped. Need to stop it — "Cancel". Details — /help/launch-queue.