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Ransomware Recovery Time Estimator

The Ransomware Recovery Time Estimator builds a practical restoration timeline from detection, containment, system rebuild, data recovery, validation, and business restart phases. Security teams, continuity planners, and operations leaders can use it to convert separate technical estimates into one end-to-end recovery duration and identify which phase dominates the outage.

The calculator uses sequential phase hours plus an optional contingency percentage for rework, queueing, vendor delays, or uncertainty. It is a planning model, not a guarantee of recovery time. Actual duration depends on the attack scope, backup integrity, identity compromise, available staff, legal or forensic requirements, and whether workstreams can run in parallel. Enter values that reflect the affected environment and your tested incident-response procedures.

Calculator inputs

hours
hours
hours
hours
hours
%
Result
—
Estimated end-to-end recovery time
Base phase time—
Contingency time—
Equivalent days—

1. Estimate each phase
Enter realistic hours for detection, containment, rebuilding, restoration, and validation.

2. Avoid double counting
Place each activity in one phase only. If tasks run in parallel, enter the expected elapsed time rather than total staff-hours.

3. Add uncertainty
Use the contingency percentage for rework, waiting time, or dependencies not captured in the phase estimates.

4. Review the total
Compare the end-to-end hours with recovery objectives, staffing plans, and tested restoration performance.

Recovery time = Sum of sequential phase hours × (1 + Contingency % ÷ 100)

Variables: Use the values and units entered above. Percentages are converted to decimals in the calculation.

What the result means

The result represents elapsed planning time for the modeled sequence, including the selected uncertainty allowance.

If phases overlap, replace their summed labor hours with the expected elapsed critical-path time.

Given:
• Detection 3 hours
• Containment 7 hours
• Rebuild 20 hours
• Restore 16 hours
• Validate 8 hours
• Contingency 25%

Calculation:
Base time = 3 + 7 + 20 + 16 + 8 = 54 hours
Contingency = 54 × 25% = 13.5 hours
Total = 67.5 hours

Result:
Estimated recovery time is 67.5 hours, or about 2.81 days. The base plan should therefore be tested against a recovery window of roughly three days.

Should I enter staff-hours or elapsed hours?

Enter elapsed hours on the recovery critical path. Adding staff-hours from parallel teams would overstate downtime.

What should contingency cover?

It can cover rework, damaged backups, access delays, vendor coordination, approval queues, or uncertainty in the initial scope.

Does recovery end when data is restored?

Not necessarily. Validation, security checks, user acceptance, and controlled restart can add significant time.

How should I model multiple systems?

Use the longest critical-path sequence or estimate each major service separately and compare the results.

Can this replace a tested recovery plan?

No. It is a planning aid; tabletop exercises and technical restoration tests provide stronger evidence of achievable recovery time.