What is Spot Length in DOOH?
Spot length refers to the duration – measured in seconds – that a single advertisement remains visible on a digital out-of-home screen. In UK DOOH campaigns, spot lengths typically range from 5 to 60 seconds, though 10, 15, 20, and 30-second spots are most common. The spot length directly impacts how much information viewers can absorb and influences the creative approach required.
Why Spot Length Matters
Spot length is critical to campaign effectiveness because it determines the creative's ability to communicate a message. A 5-second spot demands instant visual impact and minimal text – ideal for brand awareness or simple calls-to-action. A 30-second spot allows for narrative storytelling, multiple product showcases, or detailed information. Choosing the wrong length can result in wasted budget if your message doesn't fit the time available, or unused airtime if your creative finishes too quickly.
In the competitive UK DOOH landscape – from London Underground screens to shopping centres and roadside billboards – spot length affects both production costs and negotiating power with inventory owners. Shorter spots typically cost less per placement but may reach fewer viewers, whilst longer spots provide more flexibility but demand higher investment.
Typical Spot Lengths and Uses
5-10 seconds: Logo reveals, brand recalls, simple awareness campaigns, social media clips
15-20 seconds: Product launches, service announcements, directional messaging for retail
30-60 seconds: Storytelling campaigns, complex product demonstrations, emotional narratives
Considerations for UK Campaigns
When planning spot length, consider your audience's context. Commuters on the London Underground have limited engagement time (typically 30-90 seconds platform dwell), making 10-15 second spots optimal. Conversely, retail environments like Westfield shopping centres allow for longer engagement, supporting 30+ second creatives. Peak vs. off-peak scheduling also influences effectiveness – rush hour demands snappier spots, whilst quieter periods can sustain longer narratives.
Network owners often bundle spot lengths into packages. Some negotiate across multiple lengths within a single campaign to optimise reach and frequency. Always align spot length with your campaign objectives: brand awareness benefits from multiple shorter exposures, whilst conversion-focused campaigns may warrant longer, more persuasive creatives.
Production and Cost Implications
Producing multiple spot lengths from a single creative ("versioning") is standard practice and cost-effective. However, shorter cuts require tighter editing and stronger opening frames to capture attention immediately. Budget accordingly if custom lengths are needed.