Instalooter doesn't download all posts within time range

## Library version

*What's the installed library version ? Check with `instalooter --version`*:

```
instalooter v2.4.4
```

## Environment

*Describe here your environment, including:*

* *OS*
MacOS 10.15.6
* *Python version*
3.7.6
* *`setuptools` version if reporting an issue with installation*
* *non-standard Python implementation if any*

There is no obvious error; Instalooter just doesn't download all the posts within the specified time range. I'm using subprocess in my Python script:

I'm using --time, and for some accounts, it stops in July or June 2020 (it downloads everything from the end but It doesn't go all the way until Dec. 2019) the case happens with many accounts who have posts within the time period.
--time 2020-09-01:2019-12-31

It works perfectly fine with some accounts. I've added time.sleep (3 minutes) in my script but it still has not changed anything.