[Python] Is there a risk that “get_input_entity()” of Telethon will also exceed telegram API...

If we request the telegram API through get_entity('username') function of telethon too many times, we will received a “punishment”：

FloodWaitError: A wait of xxxxx seconds is required (caused by ResolveUsernameRequest).
​

According to the telethon documents, to avoid duplicated requests, we could use get_input_entity() for the first time, then we could use other function like get_entity('username'), benefiting from the saved information in cache.

My questions are below:

1. 
   if we use get_input_entity() too many times, do we get the same "FloodWaitError" like we using get_entity()? If so, what is an appropriate request interval for get_input_entity()?
   
   
2. 
   what is an appropriate way to input many entities all at once? Currently, I just use a loop to get_input_entity() some usernames from a list one by one.
   
   
3. 
   Also, after I get_input_entity() of some usernames and saved them in the cache. If I disconnect my client, do I need to get_input_entity() of them next time?
   

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