# Segment and Trait Time-to-Live Explained segment-time-to-live-explained

How trait time-to-live (TTL) interval affects segment membership.

## Time to Live

TTL defines how long a site visitor remains in a segment after the last trait qualification event. TTL is set on traits and not on segments. Visitors fall out of a segment if they do not qualify for a trait before the end of the TTL interval. The default TTL for new traits is 120 days. When set to 0 days, the trait never expires. Set the TTL value when you create or edit a trait in the Advanced Options section of the trait creation interface.

### 1 Day TTL Explained

When setting the TTL to 1 day, the TTL timer starts the next day after trait realization, not counting the hours left in the trait realization day.

Audience Manager calculates TTL expiration for traits with 1 day TTL based on the following formula:

`24 + (24 - Hour of the day the trait was realized, in UTC)`

• Example 1: A trait realized at 1:00 UTC, with a 1 day TTL. TTL will expire 24 + 24 - 1 = 47 hours later.
• Example 2: A trait realized at 23:00 UTC, with a 1 day TTL. TTL will expire 24 + 24 - 23 = 25 hours later.

## TTL and Dropping Out of a Segment

A user falls out of a segment if they do not qualify for any of its traits within the TTL interval. For example, if you have a 1-trait segment with a 30 days TTL, the user will drop out of that segment if they do not qualify for the trait again within the next 30 days.

## TTL and Segment Renewal

The TTL resets, and the user remains in a segment, if they qualify for that segmentâ€™s trait within the TTL period. Also, because most segments contain multiple traits with their own TTL intervals, a user can remain in a segment, and reset the TTL interval, as long as they keep qualifying for any traits associated with the segment.

For example, say you have Segment 1 composed of Trait A (30 day TTL) and Trait B (15 day TTL). Assuming a visitor qualifies for each trait only once, the illustration below outlines the TTL renewal process and total in-segment duration.

## Audience Manager TTLs are Independent of Third-Party TTL Settings

Remember, the TTL set on your Audience Manager pixel operates independently from the TTL set on other pixels used by third parties (DSPs, ad networks, etc.).

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