I found this sentence on jisho.org
私は１時間ではその課を全部は理解できない。
I can’t absorb all of the lesson in an hour.
Why is は 3x in here, seems like too much. Is there a better way to say this?
You have to take any sentence on jisho (and similar J -> E dictionaries) with a grain of salt. Many of them are written by non-natives and are not verified by native speakers either.
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Awww what a shame
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私は１時間ではその課を全部は理解できない。
1st は:
Topic particle(or/and contrast particle).
When there is more than one は in the sentence, the first one is normally the topic.
・・・
2nd は, or actually では(which is a compound of で + は, there are many other uses of では, for example, では contraction of それでは :
https://bunpro.jp/grammar_points/450
but this one always takes the first position in the sentence).
This is similar to ようでは from this point:
https://bunpro.jp/grammar_points/414
It will appear on N2 lesson number 8(coming soon 
):
This is the definition:
Verb[て] + は、+negative expectation・negative comment
いAdj[て] + は、+negative expectation・negative comment
なAdj + では、+negative expectation・negative comment
Noun + では、+negative expectation・negative comment
if, if are going to, since,
Aては・ではB、used when (hypothetical)outcome of an A is expected to be undesirable(B). Or to negatively comment(B) about A.
(You can write であるとすれば instead in very formal writing.)
・・・
3rd は:
As a contrast particle. Used for emphasis, often together with negative.
を全部は理解できない。
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