Letting floating (unrealized) positions run for too long in forex trading can have both positive and negative impacts. On the positive side, it allows for the potential to capture larger profits if the market moves in your favor. However, there are risks involved. Allowing floating positions to remain open for extended periods can increase exposure to market volatility, economic events, and unexpected price reversals. This may result in increased risk and potential losses if the market moves against your position. It's important to have a clear risk management plan, including setting appropriate stop-loss and take-profit levels, to mitigate the impact of letting floating positions run for too long and ensure prudent risk management.