网站上有这么几个条件：

a)You have not previously obtained an extension of stay on this trip
b)You wish to extend your stay up to 89 days from date of entry to Singapore or up to 30 days from expiry of current visit pass
c)Your visit pass has a remaining validity of at least 2 working days from date of submission. (Note: Working days are from Monday to Saturday, excluding public holidays)

关于b),就是说如果批准，是从被申请人第一天进新的时间算起的，对吧。

我的问题是关于c),说只要是不少于2个工作日，任何时间都可申请吗？比方说一来就去申请，还是放到最后一个礼拜再去申请？这个申请时间跟最终可以呆在这里的时间有没有关系？（当然如果续签批准）

谢谢。