Knowledge test
60 multiple-choice questions, 2.5 hours, 70% to pass. Heavy on regulations (Part 91 IFR rules), IFR charts (low-altitude enroute, approach plates, SIDs/STARs), weather products and minimums, and approach procedures. Reference: FAA-CT-8080-3F (testing supplement).
Your CFII must endorse you. Plan to take this near the end of training so the material is fresh for the oral.
What it actually takes
Timeline: 3–6 months part-time, 4–6 weeks accelerated. The 50-hr PIC XC requirement is usually the schedule constraint, not the instrument time itself.
Cost: $8,000–$15,000 nationally, depending on whether you fly an aircraft you already rent for private work, use a sim for portion of the 40 hr, and how efficient your training pacing is.
The honest part: the rating itself is one milestone. Single-pilot IFR proficiency is a separate ongoing project. Plan to fly approaches every month after the checkride or you'll lose the skill faster than you built it.