You have 25 HFT strategies, but our backtesting server can only run 5 strategies concurrently to compare their relative latency without recording absolute time. What's the minimum number of runs to find the top 3 fastest?

你手头有25个高频交易策略，但由于服务器限制，你的回测框架每次只能同时跑5个策略来对比它们的相对延迟（无法记录绝对时间）。最少需要跑几次才能找出延迟最低的前3个策略？