Cookie Duration

What Is Cookie Duration?

Cookie duration (or lookback period) is the timeframe a tracking cookie persists on a user's browser after clicking an affiliate link. Standard durations range from 7 days to 90 days. If a user clicks an affiliate link and a 30-day cookie is set, any purchase within 30 days is credited to that affiliate; a purchase on day 31 is not. Cookies store information in the user's browser enabling attribution across multiple sessions. Users might click an affiliate link, browse your site, leave, return a week later, and complete purchase—the persistent cookie still attributes the sale to the affiliate. Cookie duration balances fairness to affiliates (longer cookies benefit partners) against fraud prevention and accuracy (shorter cookies reduce attribution inflation). B2B SaaS with longer sales cycles typically use 30-60 day cookies; consumer products might use 7-30 day cookies. Cookie duration impacts affiliate economics significantly—longer cookies mean more attributed sales, increasing affiliate earnings. However, some jurisdictions (EU GDPR) restrict cookie duration by regulation, and privacy-focused browsers block third-party cookies entirely, reducing cookie effectiveness.

Cookie Duration Impact on Affiliate Performance

Longer cookie durations increase affiliate earnings and motivation. A 7-day cookie might credit only 30% of eventual conversions; a 30-day cookie might credit 60-70%. This 2x difference in credited conversions directly impacts affiliate compensation. Partners negotiating cookie durations often push for 30+ days. Industry standard for B2B SaaS is 30 days; e-commerce typically uses 7-30 days. Affiliate programs with generous cookie durations (60-90 days) attract and retain partners because earnings potential is higher. Conversely, restrictive durations (7 days) frustrate partners—they drive traffic but lose credit for conversions beyond a week. Cookie duration also reflects trust: longer durations signal the company trusts partners and customers, and believes in product quality. Short durations signal company concerns about attribution accuracy or fraud. Partners perceive cookie policies as program quality signal. Some high-end affiliate programs offer tiered cookie durations: 30 days for standard partners, 60 days for top-performers. This creates incentive to reach higher performance tiers while protecting fraud risk.

Technical Cookie Implementation

Cookies are small text files set by affiliate tracking domains when users click links. Format: visitor_id=abc123; path=/; expires=30d; domain=affiliate-tracker.com. First-party cookies (set on your domain) persist better than third-party cookies (set on affiliate domains) because browsers increasingly block third-parties for privacy. Modern tracking often uses first-party cookies set when users reach your domain via affiliate links. Cookie duration is specified as expiration date (30 days from click, 90 days from click, etc.). Users can manually delete cookies; some browsers auto-delete cookies between sessions. Cookie consent regulations (GDPR in EU, CCPA in California) require explicit user consent for tracking cookies, complicating implementation. Some affiliates use 'cookieless' tracking alternatives (server-to-server pixel fires, email domain matching) when cookie-based tracking fails. Mobile apps complicate cookie tracking—native apps don't use browser cookies, requiring SDK-based tracking. Progressive cookie deprecation (browsers reducing third-party cookie support) is forcing industry evolution toward first-party cookies and alternative tracking. Platforms implementing tracking should clearly document cookie duration in terms of service and privacy policies.

Cookie Duration and Compliance

GDPR (EU) limits cookie duration and requires explicit consent before tracking. Default GDPR cookie duration is 13 months for analytics, but affiliate tracking falls under advertising cookies subject to stricter requirements. CCPA (California) provides similar restrictions. Affiliate programs in regulated jurisdictions must adjust cookie durations to comply—often limiting to 30-day maximum in EU markets. Transparency requirements mandate affiliates and companies disclose cookie tracking in privacy policies. Non-compliant cookie practices trigger regulatory penalties and reputational damage. Best practices: obtain explicit user consent before setting tracking cookies, use first-party cookies where possible to improve compliance, set reasonable durations (30 days is standard), provide clear cookie policies. Affiliate programs operating internationally should implement jurisdiction-specific cookie duration policies. Reditus and affiliate platforms typically provide compliance-ready cookie implementation. Partners should understand cookie duration policies and confirm compliance with regulations in their operating regions. Cookie regulations continue evolving; staying current with changes is essential for compliant affiliate programs.