Losses and gains are not symmetric: a 50% drawdown needs a 100% gain to recover. This calculator shows the recovery gain, the years to recover at an assumed return, and compound growth.
30% drawdown needs +42.86%; at 15% a year that takes about 2.55 years.
Reference only, not investment advice. Exchange rules (maintenance margin tiers, fee tiers, funding intervals) change; check your exchange before trading.