INSIGHTS · 5 min read

GCLID and the 90-Day Problem: Why Long Sales Cycles Break Google Ads Attribution

GCLID lets Google optimize toward revenue — but it expires at 90 days. For B2B sales cycles longer than three months, here’s why you need a second attribution layer.

If you run Google Ads and have a sales cycle longer than three months, there’s a flaw in your attribution you may not know about: the Google Click ID that connects an ad click to a closed deal expires after 90 days. For B2B companies with long, considered purchases, that means the link often breaks before the deal ever closes.

What GCLID does well

A GCLID is a unique identifier Google attaches to every ad click. Captured in your CRM and written back to Google Ads as an offline conversion when a deal closes, it lets the platform optimize bidding toward the clicks that become revenue rather than the clicks that only become form fills. That is a real advantage, and worth setting up.

Where it falls short, and the fix

The 90-day expiration is the catch. Import a conversion after the window and Google won’t accept the match. So GCLID is excellent for paid-search optimization and insufficient as your only attribution strategy. The fix is a second, durable layer. Source/medium fields stored as CRM data never expire, and they persist from first click to closed-won no matter how long the cycle runs. Use GCLID for paid-search bidding and source/medium for full-funnel truth.

Frequently asked questions

How long does a GCLID last?
GCLIDs expire after 90 days. If your sales cycle is longer, the click-to-conversion link can break before the deal closes, so GCLID alone is insufficient for long B2B cycles.
What should I use instead of GCLID for long sales cycles?
Use GCLID for Google Ads bidding optimization, but pair it with persistent source/medium fields stored in your CRM — those never expire and carry attribution through to closed-won regardless of cycle length.

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