《尉缭子·攻权》
大凡集中军队，远隔千里的，不能超过十天的时间，相距百里的，不能超过一天的时间，而且必须集中在敌人边境附近。
故凡集兵千里者旬日，百里者一日，必集敌境。
 In general, when concentrating troops, if they are thousands of miles away, they cannot exceed ten days, and if they are hundreds of miles away, they cannot exceed one day, and they must be concentrated near the enemy's border.