Каждая задача, будь то новый проект или обычный отчёт, требует времени.

Because задача is a feminine singular noun, and каждый must agree with it in gender, number, and case.

So:

• masculine: каждый проект
• feminine: каждая задача
• neuter: каждое задание

In this sentence, каждая задача is also the subject, so it is in the nominative case.

Because the subject is каждая задача = each task, which is grammatically singular in Russian.

Even though the idea refers to many tasks in general, Russian treats each task as one item at a time, so the verb stays singular:

• Каждая задача требует времени. = Each task requires time.

If the subject were plural, the verb would be plural too:

• Все задачи требуют времени. = All tasks require time.

Будь то is a set expression meaning something like:

• be it ...
• whether it is ...
• whether it be ...

So:

• будь то новый проект или обычный отчёт
  = be it a new project or an ordinary report

It introduces examples or alternatives that still fit the main statement.

The overall sentence means that every task requires time, whether it’s a new project or a normal report.

Because it originally is the imperative form of быть (to be):

• будь = be!

But in будь то, it functions as part of a fixed idiomatic expression, so learners usually memorize it as a whole rather than analyzing it literally every time.

You do not need to interpret it as a real command here. It simply helps form the meaning be it / whether it be.

In будь то, то is part of the fixed phrase. It helps create the idiomatic meaning whether it be / be it.

It is best to learn будь то as one unit.

Common pattern:

• ..., будь то X или Y, ...
• ..., whether it be X or Y, ...

So in your sentence:

• Каждая задача, будь то новый проект или обычный отчёт, требует времени.

the part in the middle gives two examples of what the task might be.

Because that part is inserted as a parenthetical or explanatory phrase inside the main sentence.

Main structure:

• Каждая задача требует времени.

Inserted comment:

• будь то новый проект или обычный отчёт

So the commas mark that inserted element:

• Каждая задача, будь то новый проект или обычный отчёт, требует времени.

This is similar to English punctuation in sentences like:

• Every task, whether it’s a new project or a routine report, takes time.

Because after будь то, the nouns typically appear in the nominative, especially in this kind of identifying structure.

Here they name possible types of задача:

• новый проект
• обычный отчёт

Both are in nominative singular:

• новый проект
• обычный отчёт

They are not direct objects here, and they are not being declined to match another case. They are simply the alternatives named after будь то.

Because требовать often takes the genitive case, especially with abstract things like:

• времени = time
• усилий = effort
• внимания = attention
• денег = money

So:

• требует времени = requires time
• требует усилий = requires effort

Here времени is the genitive singular of время.

This is a very common pattern, and it is worth memorizing:

• что-то требует времени
• что-то требует усилий
• что-то требует терпения

Времени is the genitive singular form of время.

Declension:

• nominative: время
• genitive: времени
• dative: времени
• accusative: время
• instrumental: временем
• prepositional: времени

In this sentence, the genitive is used because of the verb требовать.

The basic sentence is:

• Каждая задача требует времени.

The phrase будь то новый проект или обычный отчёт is inserted in the middle to clarify what kinds of tasks are meant.

Russian word order is flexible, but this version is natural because it works like:

1. statement of the subject: Каждая задача
2. inserted clarification: будь то новый проект или обычный отчёт
3. main predicate: требует времени

This makes the sentence sound balanced and polished.

Yes, the standard form is отчёт with ё.

In many Russian texts, ё is often replaced in writing by е, so you may also see:

• отчет

But the pronunciation and the dictionary form are still отчёт.

For learners, it is helpful to remember the ё, because it tells you the stress clearly:

• отчёт = stress on the last syllable

It is somewhat bookish or polished, but still very normal and widely understood. You will often see it in:

• formal writing
• journalism
• essays
• presentations
• careful speech

It sounds a bit more elegant than a very plain alternative.

For example, a simpler rewording could be:

• Каждая задача — новый проект или обычный отчёт — требует времени.
• Любая задача, будь то новый проект или обычный отчёт, требует времени.

So будь то is not strange or rare, but it does have a slightly elevated tone.