loan tenor of 90 days是什么意思？If there is late acceptance from buyer for sight LC, 需要怎么做？

原邮件是这样子的：
why there is loan tenor of 90 days? Is it a usance LC of 90 days? If there is late acceptance from buyer for sight LC, what will they do? Immeditately call back fund from you??
请帮忙翻译并提出解决的办法，谢谢!

为什么会是90天的贷款期限？不是90天的远期信用证吗？如果买方因即期信用证而逾期接受，他们该做什么？立即撤回资金吗？

从内容上应该是外贸邮件，可惜偶不是是这行的，只能提供文字翻译了。懂外贸的楼下继续。