[求助] 压片 字幕只想显示在开头和结尾30秒 ssa文件怎么改

以下是ssa源文件
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0010,,{\pos(583,20)}{\fs55}{\fn汉仪凌波体繁}{\b1}{\alpha&HA7&\c&H000000&}{\shad1}{\bord0}S
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0010,,{\pos(548,20)}{\fs55}{\fn汉仪凌波体繁}{\b1}{\alpha&HA7&\c&H000000&}{\shad1}{\bord0}S
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0010,,{\pos(565,20)}{\fs55}{\fn汉仪凌波体繁}{\b1}{\alpha&HA7&\c&H000000&}{\shad1}{\bord0}I
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0010,,{\pos(608,22)}{\fs18}{\fn创艺简粗黑}{\b1}{\alpha&HA7&\c&H000000&}{\shad1}{\bord0}BT
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0010,,{\pos(608,38)}{\fs10}{\fn创艺简粗黑}{\b1}{\alpha&HA7&\c&HFFFFFF&}{\shad1}{\bord2}压\N缩\N组
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0000,,{\pos(330,300)}{\fs15}{\fn创艺简粗黑}{\1c&HFF0000&}{\3c&H00FFFF&}{\b2}{\shad1}{\bord2}{\t(0,7000,\fry1440)\a10}欢迎访问 http://www.sexinsex.net 影视娱乐论坛
Dialogue: Marked=0,0:00:00.00,0:10:20.00,00,NTP,0000,0000,0000,,{\pos(100,35)}{\fs15}{\fn華康華綜體}{\alpha&H4A&\c&H00FFFF&}{\b2}{\shad1}{\bord2}{\t(0,7000,\fry1440)\a10}→★pingheng\h{\fn黑体}压制★←

请问时间那里 0:10:20.00 怎么改能满足要求？

这个就是只显示前30秒，如果你要显示后30秒，假如视频有一个小时，你就把什么的代码复制一份，放到最下面，显示时间改成从59：30到60：00就可以了，注意都要修改。

非常感谢 终于知道怎么弄了 谢谢大大的回答！