This site draws a specific distinction worth understanding: calmer focus within the first few weeks, while memory-specific benefits are best judged over a couple of months.
Rather than giving one blanket timeline for the whole formula, this site is direct that focus-related and memory-related benefits are expected on genuinely different schedules — worth planning your own evaluation around whichever outcome matters more to you.
L-Theanine is tied to the faster, focus-related timeline, while Bacopa Monnieri, a well-studied but slower-acting nootropic herb, is tied to the longer, memory-related timeline, per this site's own framing.