That documentation is very misleading. The crucial thing is that it says: ‘The following table exemplifies this concept’, ie the table is examples, not the only permissible possibilities.
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The table below is a comment extracted from my code, which shows the maximum durations I use for all the various allowable bar sizes. I determined these by trial and error. I haven’t updated it for several years, and it’s certainly not entirely correct now: for example I just had 13051 1-min bars returned in a single call using a duration of 30D.
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So I suggest you use the info below as a guide to what might be possible, but bear in mind that you may well be able to improve on this. Just try it and see!
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'?? Bar Size??????? Max Duration
'?? --------??????? ------------
'
'?? 1 secs????????? 2000 S
'?? 5 secs????????? 10000 S
'?? 10 secs???????? 20000 S
'?? 15 secs???????? 30000 S
'?? 30 secs???????? 86400 S
'?? 1 min?????????? 86400 S
'?????????????????? 6 D
'?????????????????? 1 W
'?? 2 mins????????? 86400 S
'?????????????????? 10 D
'?????????????????? 2 W
'?? 3 mins????????? 86400 S
'?????????????????? 10 D
'?????????????????? 2 W
'?? 5 mins????????? 86400 S
'?????????????????? 20 D
'?????????????????? 3 W
'?? 10 mins???????? 86400 S
'?????????????????? 50 D
'?????????????????? 8 W
'?? 15 mins???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?? 20 mins???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?? 30 mins???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?????????????????? 3 M
'?????????????????? 1 Y
'?? 1 hour????????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?????????????????? 3 M
'?? 2 hours???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?????????????????? 3 M
'?? 3 hours???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?????????????????? 3 M
'?? 4 hours???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?????????????????? 3 M
'?? 8 hours???????? 86400 S
'?????????????????? 50 D
'?????????????????? 10 W
'?????????????????? 3 M
'?? 1 day?????????? 86400 S
'?????????????????? 365 D
'?????????????????? 12 M
'?????????????????? 52 W
'?????????????????? 50 Y
'?? 1 W???????????? 86400 S
'?????????????????? 365 D
'?????????????????? 12 M
'?????????????????? 52 W
'?????????????????? 50 Y
'?? 1 M???????????? 86400 S
'?????????????????? 365 D
'?????????????????? 12 M
'?????????????????? 52 W
'?????????????????? 50 Y
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