What's the difference between 近々 and 間もなく?


I checked the Weblio sentences for 近々 and I saw this:

> We are to start shortly. 近々に出発の予定です.

This reminded me of 間もなくwhich I often hear in trains. What is the difference
between the two?

I checked some links [here](https://hinative.com/ja/questions/2904961) and
[here](https://hinative.com/ja/questions/5618140). What are your thoughts on
this?




**Range of Time**

近々 is in several days, months, or (possibly) years. I wouldn't say 近々 in
several minutes or hours. 間もなく is used in wider range of time.

**Relevance of Time**

近々 can only be used as the 'soon' from current time, while 間もなく can be used
with relative time.

> そのチケットは販売開始から **間もなく** 売り切れた

> The tickets was sold out right after started to sell.

You can't replace this sentence with 近々.

**Other Nuance**

近々 also has a nuance like something coming.  
間もなく often focuses on people who are waiting for something. It originally
means "no time (to wait)". So in many cases, it's used for people to accept
waiting for more seconds. "間もなく列車が参ります" (A train is arrived in a second) is
very famous phrase in urban area of Japan.




**Range of Time**

近々 is in several days, months, or (possibly) years. I wouldn't say 近々 in
several minutes or hours. 間もなく is used in wider range of time.

**Relevance of Time**

近々 can only be used as the 'soon' from current time, while 間もなく can be used
with relative time.

> そのチケットは販売開始から **間もなく** 売り切れた

> The tickets was sold out right after started to sell.

You can't replace this sentence with 近々.

**Other Nuance**

近々 also has a nuance like something coming.  
間もなく often focuses on people who are waiting for something. It originally
means "no time (to wait)". So in many cases, it's used for people to accept
waiting for more seconds. "間もなく列車が参ります" (A train is arrived in a second) is
very famous phrase in urban area of Japan.

