How long are you going to arrive in/at?是错的,应该是How long are you going to arrive?也就是How long是副词,arrive后不加介词?How long整一个是不是疑问副词?

how soon
多少时间之后；多久；多快
how long
有多久
arrive 后面可加可不加地点，arrive+in/at+somewhere
当后面没有地点时，arrive后面什么都不要
至于这两句句子，楼上的朋友已经说得很清楚了！
补充：
arrive [ə'raiv] vi. 到达；成功；出生；达成
[ 过去式arrived 过去分词arrived 现在分词arriving ]
arrive [ə'raiv]
vi.
1. 到，抵达，到达(目的地)，来到(一地方)，到来：
例句: She finally arrived in New York.
她终于到达纽约。
We arrived at the station as the train was leaving.
我们到达车站时火车就要开出了。
2. 达到(某点或某阶段)：
例句: to arrive at manhood已成年
3. (时间等)来临，来到：
例句: The moment to act has arrived.
行动时机已到。
The time has arrived for action.
行动时间已到。
4. [口语] 成功，成名；得到认可：
例句: He has arrived professionally.
他在业务上已成名。
After years of hard work, she has finally arrived in her field.
经过多年的努力工作之后她终于在她的领域功成名就了。
5. 得到(结论)；获得(结果)(at)：
例句: to arrive at an agreement
达成协议How did your calculation arrive at this figure?
你的计算怎么会得出这个数字的?
6. (婴儿)出生：例句: to arrive ahead of time
早产
7. (东西)被送来：
例句: Year after year the new books continued to arrive.
年复一年，新书不断送来。
8. [古语] 碰巧发生：
例句: It arrived that the manager had already departed.
碰巧经理已离开了。
vt.[古语]到达，抵达

how long 是对一段时间提问的疑问副词 注意是一段时间 而你以上两句话 是对某一瞬时时间的提问 故不对

都不对,是how soon are you going to arrive?加介词就必须要有宾语,所以你这个理解是对的,但how long后面的动词应该能延续,how soon表多久以后,对

两个句子都不对。应该是how soon are you going to arrive？