Great question, and one I've spent a fair amount of time chewing on. From my experience running growth across several consumer-facing startups, the timing dynamic does seem to shift depending on the pin type-but not in the way most people assume.
Standard pins behave more like a slow-burn content asset. They accumulate visibility over days or weeks, partly because the algorithm treats them as evergreen signals. Post timing matters for the initial push, but if the content is strong, it'll catch a second wind regardless of when it went live.
Idea pins, on the other hand, feel more like a short-form video feed. They live and die on immediate engagement velocity. The first few hours are brutal. If you don't hit the right audience within that window, the algorithm moves on. It's similar to the difference between seeding a blog post and launching a TikTok-the latter demands you surf the current wave, not just drop a message in a bottle.
Macro trend I've been watching: as platforms shift further toward ephemeral and immersive content, the timing window tightens across the board. Idea pins are the canary in the coal mine for that shift. So yes, timing matters more for them-but the real variable is whether you're chasing a spike or building a long tail.