Wij werken hybride, zij het alleen tijdens de kernuren.

Zij het is a fixed, somewhat formal expression meaning something like although only, be it, albeit, or except that.

In this sentence, it introduces a limitation to the first statement:

• Wij werken hybride = we work in a hybrid way
• zij het alleen tijdens de kernuren = but only during the core hours / albeit only during the core hours

So zij het does not literally work like the normal pronoun zij meaning she/they. It is part of an idiomatic expression.

Dutch often uses zij het in more formal or written language to add a qualification or restriction.

Compare:

• Wij werken hybride, maar alleen tijdens de kernuren.
  = perfectly natural, more straightforward and everyday

• Wij werken hybride, zij het alleen tijdens de kernuren.
  = a bit more formal, polished, or written in tone

So the difference is mainly one of style/register, not basic meaning.

No. In zij het, zij is not functioning as the normal subject pronoun.

This is one reason the phrase can feel confusing to learners: it looks familiar, but in this expression it is part of a fixed construction that you should learn as a whole: zij het.

So it is best not to analyze it as:

• zij = they/she
• het = it

Instead, treat zij het as one unit meaning albeit / though / be it.

In modern Dutch, it is usually best to think of het here as simply part of the fixed expression, rather than trying to assign it a very clear separate meaning.

Historically, the phrase comes from older language, but for a learner the practical approach is:

• memorize zij het as a set phrase
• understand its function: it introduces a restriction or concession

So in this sentence, zij het alleen tijdens de kernuren means with the limitation that it is only during the core hours.

Here hybride is used in a way that English speakers often find unusual. It comes from the adjective hybride (hybrid), but in sentences like hybride werken it functions more like a predicate complement describing the manner or type of working.

So:

• Wij werken hybride = literally We work hybrid
• more natural English: We work in a hybrid way / We work partly at home and partly on site

This kind of usage is very common in modern Dutch, especially in workplace language:

• hybride werken
• digitaal vergaderen
• flexibel werken

Because hybride is not directly placed before a noun here.

Compare:

• het hybride model = the hybrid model
• een hybride auto = a hybrid car
• wij werken hybride = we work hybrid / in a hybrid way

In wij werken hybride, hybride is not attributive (not directly modifying a noun), so you do not think about adjective endings in the same way. It is part of the expression hybride werken.

Kernuren means core hours: the central part of the working day when everyone is expected to be available.

For example, a company might allow flexible start and end times, but require everyone to be reachable from, say, 10:00 to 15:00. Those would be the kernuren.

It is a common term in office and HR contexts.

Because zij het introduces the qualification, and what follows states that qualification.

Structure:

• main statement: Wij werken hybride
• qualification: zij het alleen tijdens de kernuren

This is similar to English:

• We work hybrid, albeit only during the core hours.

So alleen tijdens de kernuren is the content of the limitation introduced by zij het.

That would sound much less natural and could even be confusing.

The original sentence is clearer because it first states the general idea:

• Wij werken hybride

and then adds the restriction:

• zij het alleen tijdens de kernuren

If you want a simpler alternative, these are more natural:

• Wij werken hybride, maar alleen tijdens de kernuren.
• Wij werken alleen tijdens de kernuren hybride.
  This is possible in some contexts, but it sounds more awkward and places heavy focus on the time restriction.

So the original sentence is well-structured and stylistically neat.

Yes, it sounds fairly formal, especially because of zij het.

The rest of the sentence is neutral business Dutch:

• Wij werken hybride
• tijdens de kernuren

But zij het gives it a slightly official, polished, or written tone. You might see it in:

• company policy documents
• HR communication
• reports
• formal emails

In everyday speech, many speakers would simply say:

• Wij werken hybride, maar alleen tijdens de kernuren.

Yes. It is a useful formal connector for adding a limitation.

For example:

• De resultaten waren positief, zij het beperkt.
  = The results were positive, albeit limited.

• Het plan is goed, zij het nogal duur.
  = The plan is good, although rather expensive.

• Hij kwam opdagen, zij het te laat.
  = He did show up, though too late.

So the pattern is often:

• statement + zij het
  • limiting comment

Yes: the comma is important and natural.

• Wij werken hybride, zij het alleen tijdens de kernuren.

The comma helps show that the second part is a qualification added to the first part. Without the comma, the sentence would be harder to read and less standard.

This punctuation is similar to English formal writing with albeit or though inserted after a pause.

A native speaker might say:

• Wij werken hybride, maar alleen tijdens de kernuren.
• Wij werken alleen tijdens de kernuren hybride.
• We werken hybride, maar wel alleen tijdens de kernuren.

The first option is probably the clearest and most everyday alternative.

So if you understand the original but do not yet feel ready to use zij het yourself, using maar is a very safe choice.