How does "curl --retry-max-time <seconds>" work?

Question

I don't know how --retry-max-time calculated. If I download a file file.txt:

curl --max-time 10 --retry 3 --retry-delay 5 --retry-max-time 32 'http://www.site.com/download/file.txt' 

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• [ 0- 2] It takes 2s to download 50% of the file, and no speed any more.
• [ 2-10] It waits for another 8s, still no speed, timeout, will retry
• [10-15] It waits for 5s before retry #1
• [15-25] Still no speed, will retry
• [25-30] It waits for 5s before retry #2
• [30-34] It takes 4s to download 33% of the file, and no speed any more.
• [34-40] It waits for another 6s, still no speed, timeout

Will curl stop retry at this point(40s)?

When was the retry timer started and stopped?

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   --retry-max-time <seconds>           The  retry  timer  is reset before the first transfer attempt. Retries will be done as usual (see --retry) as           long as the timer hasn't reached this given limit. Notice that if the timer hasn't  reached  the  limit,  the           request  will be made and while performing, it may take longer than this given time period. To limit a single           request´s maximum time, use -m, --max-time.  Set this option to  zero  to  not  timeout  retries.  (Added  in           7.12.3) 

Answer 1

curl --connect-timeout 5 \      --max-time 10 \      --retry 5 \      --retry-delay 0 \      --retry-max-time 60 \      'http://www.site.com/download/file.txt' 

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|<---0---->| {<---1---->|  |<---2---->|    |<---3---->|   |<---4---->|   }            |<---5---->| |....==    | {...==     |  |....==    |    |.....|        |..=== =   |   }              {                                                           } 

NOTATION

=====  downloading...       (file size is 5) .....  --connect-timeout 5 |<->|  --max-time 10 <-5->  --retry 5 >| |<  --retry-delay 0      ([default] exp backoff algo) {   }  --retry-max-time 60  (GAME OVER) 

NOTE

• retry delay 1, 2, 4, 8 ...
• retry #3 connect timeout
• retry #5 never happen
• download failed at END (71 sec)