阅读下面短文，根据其内容写一篇60词左右的内容概要。

Many of us worry that we don’t put in enough time to maintain close friendships. But how much is enough? Unfortunately, there’s no magic formula (公式) for how much time you need to spend on your friends to keep them. Each friendship and each friend is unique and develops or ends depending on how we interact.

Forming a friendship in the first place takes a certain number of hours of being together. We need between 40 and 60 hours together for a person we know slightly (稍微) to become a casual friend. In order to move from casual friends to close friends, we need to spend an additional 140 to 160 hours together for a total of about 200 hours.

However, deeper interactions can quicken that timeline. We can form a close bond (关系) in less than 200 hours with meaningful conversations. Contrarily, spending 200 hours together doesn’t necessarily mean a person will become a close friend. They have to want to be your friends. Some co-workers can spend 300 hours together and never become close friends.

When it comes to maintaining (维持) friendships, it’s not just the number of hours spent together, but what we do that matters. Engaging in passive activity with friends—like watching a TV series—is fun and enjoyable, but it doesn’t do as much to maintain friendship as having deep conversations, sharing feelings, and being a good listener. And often checking in with people we choose to connect with, through calls and texts or in person, helps maintain relationships and leads to higher scores of positive feelings, like happiness.

The key point is that sharing things about ourselves can lead to close friendships. Once that closeness is set up, some ways to maintain closeness are supporting friends when things go wrong for them and celebrating their achievements.

参考范文：

Friendship maintenance and development depend on how to interact. The amount of time needed to form and maintain friendships varies, with deeper interactions quickening the process. It’s not just the number of hours spent together, but the quality and frequency of interaction that matters. Sharing personal experiences and supporting friends through ups and downs are key to maintaining close bonds.

本文是一篇议论文。这篇文章讨论了建立和维护友谊所需的时间，指出需要至少200小时才能发展成为亲密的朋友。尽管没有固定的时间公式，但深入的对话和情感分享可以加快友谊的建立。维持友谊不仅取决于相处时间，还包括深入交流、支持朋友、庆祝成就等积极行为。关键在于分享并保持真诚的互动，这有助于建立和巩固亲密友谊。

(详解)

1. 要点摘录

①Each friendship and each friend is unique and develops or ends depending on how we interact.

②Forming a friendship in the first place takes a certain number of hours of being together.

③However, deeper interactions can quicken that timeline.

④When it comes to maintaining (维持) friendships, it’s not just the number of hours spent together, but what we do that matters.

⑤The key point is that sharing things about ourselves can lead to close friendships. Once that closeness is set up, some ways to maintain closeness are supporting friends when things go wrong for them and celebrating their achievements.

2. 缜密构思

将第2、3两个要点总说，将第1、4、5两三个要点进行分说。

3. 遣词造句

How to maintain and develop friendship depends on how we can interact. The amount of time needed to form and maintain friendships varies, deeper interactions quickening the process.

It’s not only just the number of hours spent together, but also the quality and frequency of interaction that matters.

Sharing personal experiences and supporting friends through ups and downs are crucial to maintaining close bonds.

(点睛)

(高分句型1) “The amount of time needed to form and maintain friendships varies, with deeper interactions quickening the process.” (运了用with复合结构做状语。)

(高分句型2) “Sharing personal experiences and supporting friends through ups and downs are key to maintaining close bonds.” (运用了动名词做主语和宾语。)