B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
31%
31% -- percentage of agencies with engagements over 36 months for Agencies (2025)
31% of agencies report typical client engagements lasting over 36 months.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
31%
Unit
Percentage
Data Vintage
2025
Entity
Sample Size
376
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Sparktoro
Primary
Tier B
https://arvow.com/blog/seo-agency-statistics-2026 ↗
Source Article
SEO Agency Statistics 2026: 89+ Sourced Stats
Original Research
Sparktoro
· Original study ↗
Methodology
Sparktoro 2025 panel
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Agencies: 31% percentage of agencies with engagements over 36 months. Source: Sparktoro (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/engagements-36-months-plus
HTML Embed
<blockquote cite="https://lighthousedata.io/data/engagements-36-months-plus" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>31%</strong> -- percentage of agencies with engagements over 36 months for Agencies<br><small>Source: Sparktoro (2025) · <a href="https://lighthousedata.io/data/engagements-36-months-plus" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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