You'll see clicks the first day, credible cost-per-lead data in 2–4 weeks, and a trustworthy verdict on the channel in about 60–90 days. Anyone promising profitable ads in week one is describing luck.
Two clocks run under the hood: statistical (you need enough conversions — think 30+ — before averages mean anything) and algorithmic (Smart Bidding enters a learning phase after launch and after big changes, typically a week of wobble).
The honest schedule: weeks 1–2 confirm tracking and kill obvious junk searches via the search-terms report; weeks 3–6 concentrate budget on what produces leads; day 60+ judge the channel on measured CPL against your break-even — not on feelings.