What is Loop Length in DOOH?
Loop length refers to the total time it takes for all advertising content displayed on a digital out-of-home (DOOH) screen to complete a full rotation before repeating from the beginning. For example, if a screen shows five 10-second ads, the loop length is 50 seconds.
Why Loop Length Matters
Loop length is a critical metric in out-of-home media planning because it directly affects:
Frequency and reach: Shorter loops mean your ad appears more frequently within a given time period. A 30-second loop in a busy location (like a London tube platform) can generate dozens of impressions per hour, while longer loops reduce frequency.
Creative optimization: Your ad length and messaging must align with available loop slots. A 15-second spot requires different creative than a 30-second placement, and understanding loop structure helps you allocate budget effectively.
Competitive positioning: Loop length determines how many advertisers share screen time. A crowded 60-second loop with eight 7.5-second spots means more competition for attention than a simpler 20-second loop with three spots.
Common Loop Lengths in the UK Market
UK DOOH inventory typically operates on standardised loop structures:
- Short loops (10-30 seconds): High-frequency environments like train platforms, bus shelters, and retail checkouts. Ideal for brand awareness and impulse messaging.
- Medium loops (30-60 seconds): General retail and street-level screens. Balances frequency with creative breathing room.
- Long loops (60+ seconds): Premium transit environments and large-format screens where advertisers expect longer dwell time.
Practical Considerations
When negotiating DOOH placements, always clarify loop length early. A premium location with a 90-second loop may deliver fewer impressions than a standard location with a 20-second loop. Your media agency should analyse both loop length and daily footfall to calculate true frequency potential.
Loop length also affects pricing. Shorter, more competitive loops typically command premium rates because they guarantee higher frequency and better positioning within the rotation.
Integration with Campaign Planning
Effective DOOH campaigns account for loop length when planning media mixes. Shorter loops work well for frequency-based campaigns targeting commuters, while longer loops suit narrative-driven creative in dwell environments like shopping centres.