The timeline for a private investigation rarely follows a one-size-fits-all schedule—it depends heavily on the case type, complexity, and how quickly you need answers. Most investigations take anywhere from a few days to several months, with some cases stretching much longer. Understanding what affects that timeline helps you set realistic expectations and budget accordingly.
What Determines Investigation Length
The scope of your case is the biggest factor in how long an investigator needs. A background check on a single person might wrap up in 2–5 business days, while tracking down a missing person across multiple states or uncovering infidelity with international connections could take 4–8 weeks or more.
Case complexity also matters. Straightforward tasks like verifying an employment history are faster than cases requiring surveillance, interviews with multiple sources, or accessing records that need legal requests. Investigators must follow legal protocols—they can't cut corners to speed things up, which sometimes adds time.
Common Investigation Types and Typical Timelines
Background Checks Usually completed within 1–3 business days for basic checks; comprehensive checks run 3–7 days. These involve public records, criminal history, employment verification, and credit checks (with consent).
Infidelity & Spousal Investigations Expect 2–4 weeks minimum. Investigators need time to establish patterns of behavior, conduct surveillance, and gather admissible evidence. Some cases take longer if the subject travels or varies their routine significantly.
Missing Person Investigations Timeline varies wildly based on whether the person is truly missing or hiding voluntarily. Initial leads might surface in days, but locating someone who doesn't want to be found can take weeks to months.
Workers' Compensation & Fraud Cases These typically run 2–6 weeks. Investigators monitor claimants, interview witnesses, and review medical records. The surveillance phase alone can take multiple weeks to build a solid case.
Asset & Locate Investigations Expect 1–3 weeks for standard asset searches or locating someone with an address. More complex financial cases or multi-country locates can extend to 2–3 months.
Corporate & Internal Investigations These are unpredictable and can range from 1–2 weeks for a simple interview-based investigation to 3+ months for complex embezzlement cases requiring forensic accounting.
How to Speed Things Up (and What Slows You Down)
Investigators work faster when you provide clear, detailed initial information. If you can give them names, addresses, phone numbers, photos, or known associates, they skip hunting for basic facts and jump straight to active investigation.
Legal roadblocks slow most cases down. Accessing certain records requires subpoenas, warrants, or written consent. Court backlogs, uncooperative witnesses, and the need to maintain chain-of-custody documentation all add days or weeks.
Your budget also affects pace. Many investigators charge hourly rates (typically $50–$150/hour, depending on experience and location) or flat fees for specific tasks. Rush cases or hiring multiple investigators simultaneously can accelerate results but at higher cost.
Questions to Ask Your Investigator
Before hiring, clarify:
- How will they estimate the total timeline for your specific case?
- What's their hourly rate or project fee, and are there retainer options?
- Will they provide weekly progress updates?
- What happens if the investigation exceeds the estimated timeframe?
- Do they charge for expenses (travel, database access) separately?
Working with Investigation Providers
When you're ready to hire, look for investigators licensed in your state (requirements vary by location). Verify they carry liability insurance and belong to professional organizations like the National Association of Investigative Specialists (NAIS).
Compare providers by checking references, reading client reviews, and asking about their experience with cases similar to yours. Mercoly makes it easy to find, compare, and hire trusted private investigators in your area, so you can evaluate multiple quotes and timelines side-by-side before making a decision.
Frequently Asked Questions
Q: Can a private investigator guarantee they'll find what I'm looking for in a specific timeframe? Reputable investigators won't promise guaranteed timelines because circumstances change—people move, hide their tracks, or alter their behavior once they suspect surveillance. They should estimate based on experience, but guarantee only effort and adherence to legal protocols.
Q: What's the difference between a retainer and paying per hour? A retainer is an upfront fee (usually $500–$2,500) that gets depleted as the investigator works at their hourly rate; hourly billing charges you only for actual hours worked with no upfront commitment, though it's less predictable for your budget.
Q: Will my case go faster if I pay more? Paying more can accelerate cases if you hire additional investigators or authorize more surveillance days, but legal processes (like obtaining records) can't be rushed regardless of budget.
Ready to find the right investigator for your timeline and budget? Start comparing local providers today.