השיעור הקבוע שלנו מתחיל ביום רביעי בערב ונמשך שעתיים.

Here שיעור means a lesson or a class session. In everyday English, our regular class is a very natural translation.

Hebrew שיעור can mean several things in different contexts, including:

• lesson / class session
• lecture
• rate / percentage

In this sentence, it clearly means the class meeting itself, not a classroom or a percentage.

In Hebrew, adjectives normally come after the noun they describe.

So:

• שיעור קבוע = a regular class
• השיעור הקבוע = the regular class

This is different from English, where adjectives usually come before the noun.

Because the noun phrase is definite.

In Hebrew, when a noun is definite and has an adjective, the adjective also becomes definite.

So:

• שיעור קבוע = a regular class
• השיעור הקבוע = the regular class

This agreement in definiteness is very important in Hebrew.

Hebrew possessive words like שלי, שלך, שלנו usually come after the noun.

So:

• השיעור שלנו = our class
• השיעור הקבוע שלנו = our regular class

That is the normal Hebrew order. English puts our before the noun, but Hebrew usually does not.

Because the subject, השיעור, is masculine singular.

In the present tense, Hebrew verbs agree with the subject in gender and number:

• מתחיל = masculine singular
• מתחילה = feminine singular
• מתחילים = masculine plural
• מתחילות = feminine plural

Since שיעור is masculine singular, both verbs in the sentence are masculine singular:

• מתחיל
• נמשך

Literally, it is something like on Wednesday in the evening.

Breaking it down:

• ב־ = in / on / at
• יום רביעי = Wednesday
• בערב = in the evening

So ביום רביעי בערב means on Wednesday evening.

A useful thing to remember is that Hebrew ב־ covers several English prepositions, so its exact translation depends on the context.

Because יום רביעי is the normal name of the weekday Wednesday.

Hebrew days of the week are commonly expressed like this:

• יום ראשון = Sunday
• יום שני = Monday
• יום שלישי = Tuesday
• יום רביעי = Wednesday

So ביום רביעי is simply the standard way to say on Wednesday.

By itself, ביום רביעי בערב can refer to Wednesday evening in a general schedule statement or to a specific Wednesday, depending on context.

Because the sentence says השיעור הקבוע שלנו — our regular class — many learners will understand it as part of a regular schedule.

If you want to make the repeating meaning clearer, Hebrew often says:

• כל יום רביעי בערב = every Wednesday evening
• בימי רביעי בערב = on Wednesday evenings

So the original sentence is natural, but a more explicitly recurring version is also possible.

ונמשך means and lasts or and continues for.

It is made of:

• ו־ = and
• נמשך = lasts / continues

The root is מ־ש־ך, connected with the idea of drawing out or continuing. In this sentence, the natural English meaning is simply lasts.

So:

• מתחיל = starts
• ונמשך שעתיים = and lasts two hours

שעתיים is the special Hebrew dual form meaning two hours.

Hebrew has special forms for some things that come in twos, especially units of time:

• יומיים = two days
• שבועיים = two weeks
• חודשיים = two months
• שעתיים = two hours

So שעתיים is the most natural way to say two hours here.

You may also hear שתי שעות, which is grammatical, but שעתיים is very common and idiomatic.

Because Hebrew often expresses duration without a separate word like English for.

So:

• נמשך שעתיים = lasts two hours
• literally, something like continues two hours

This is completely normal in Hebrew.

You can also say:

• נמשך במשך שעתיים = lasted for two hours

But in many cases, the shorter version is more natural.

The given word order is very natural and neutral:

השיעור הקבוע שלנו מתחיל ביום רביעי בערב ונמשך שעתיים.

Hebrew does allow some flexibility, especially if you want to emphasize the time:

ביום רביעי בערב השיעור הקבוע שלנו מתחיל ונמשך שעתיים.

That version is also possible, but the original sentence is the most straightforward way to present the information.