How much incremental time does it take to prep restructuring interviews?

For junior summer. Assuming you have already prepped the questions that could come up in classic M&A/banking (accounting, valuation, LBO, so forth) as well as standard behaviorals (non restructuring related), how long would it take before you can succeed in top restructuring group interviews? Assume you have zero knowledge of restructuring, bankruptcy, capital structure, debt, so forth (above what is expected in normal banking interviews)