keiyakukikan ga nagai ka mizikai ka ni kakawarazu, kaiyakukin wo kakuninsuru.

It means regardless of whether A or B.

So:

• 契約期間が長いか短いかにかかわらず = regardless of whether the contract period is long or short

This pattern is used when the result or action in the main clause does not change, no matter which of the two possibilities is true.

A useful pattern to remember is:

• AかBかにかかわらず、C
• Regardless of whether A or B, C

In this sentence, C is:

• 解約金を確認する
• check the cancellation fee

The two か particles mark two alternatives.

• 長いか短いか = whether it is long or short

The first か separates the first option from the second:

• 長いか短い
• long or short

The second か closes the whole whether A or B expression before にかかわらず.

So the structure is:

• A か B か
• whether A or B

This is very common in Japanese:

• 行くか行かないか分からない = I don’t know whether I’ll go or not
• 高いか安いかを見る = check whether it is expensive or cheap

In this grammar pattern, にかかわらず is treated as a set expression.

So you learn it as:

• 〜にかかわらず
• regardless of ~
• irrespective of ~

The に is part of the grammar, not something you would usually translate separately.

For example:

• 年齢にかかわらず = regardless of age
• 天候にかかわらず = regardless of the weather
• 契約期間が長いか短いかにかかわらず = regardless of whether the contract period is long or short

So it is best to memorize にかかわらず as one unit.

Here, 契約期間が長いか短いか is an embedded clause: it is part of a larger structure, not the main topic of the whole sentence.

In embedded clauses, が is often used to mark the subject more naturally than は.

So:

• 契約期間が長い = the contract period is long

Inside 長いか短いかにかかわらず, the sentence is talking about the condition whether the contract period is long or short, so が fits well.

If you used は, it might sound more contrastive or topic-like, and less neutral in this structure.

This is a very common pattern in Japanese:

• 値段が高いか安いか
• whether the price is high or low
• 店が開いているかどうか
• whether the store is open or not

Yes, literally they mean long and short, but in Japanese they are commonly used for things like time periods, schedules, distances, and durations.

So:

• 契約期間が長い = the contract period is long
• 契約期間が短い = the contract period is short

This is perfectly natural Japanese.

You will see the same with other time-related nouns:

• 時間が長い = the time is long
• 期間が短い = the period is short
• 待ち時間が長い = the waiting time is long

So even though English might phrase it differently sometimes, Japanese naturally uses 長い / 短い here.

In this pattern, かかわらず means something like:

• without regard to
• regardless of
• irrespective of

So 〜にかかわらず says that the next action or result stays the same no matter what the preceding condition is.

For example:

• 男女にかかわらず参加できます = You can participate regardless of gender
• 経験の有無にかかわらず応募可能です = You may apply regardless of whether you have experience

In your sentence:

• 契約期間が長いか短いかにかかわらず、解約金を確認する。 = Regardless of whether the contract period is long or short, check the cancellation fee.

Yes. In Japanese, the dictionary form is often used in:

• manuals
• instructions
• headings
• notes
• formal written guidance

So 確認する here does not necessarily mean I check in a personal sense. It can function more like:

• check
• make sure to check
• one should check

This style is common in practical or informational writing.

Compare:

• ボタンを押す = Press the button
• 内容を確認する = Check the contents
• 解約金を確認する = Check the cancellation fee

So the sentence sounds like a rule, reminder, or checklist item.

The comma marks a pause between the condition-like phrase and the main action.

So the sentence is divided like this:

• 契約期間が長いか短いかにかかわらず、
• 解約金を確認する。

This makes it easier to read:

• first, the regardless of whether... part
• then, the main instruction: check the cancellation fee

Japanese commas are often used more flexibly than English commas, but here it is very natural because the first part is fairly long.

Not naturally in the same way.

• 長いか短いか explicitly gives the two alternatives: long or short
• かどうか means whether or not

You could say:

• 契約期間が長いかどうか = whether the contract period is long or not

But that only focuses on long vs. not long. It does not neatly present the pair long or short.

Since the sentence is contrasting two clear opposites, 長いか短いか is the better form.

So:

• 長いか短いか = whether it is long or short
• 長いかどうか = whether it is long or not

Yes, it is somewhat formal and is very common in written Japanese, announcements, rules, contracts, advertisements, and explanatory text.

It sounds more formal than some everyday alternatives.

For example:

• 天気にかかわらず実施します = It will be held regardless of the weather

This sounds natural in a notice or formal statement.

In casual conversation, people might use other expressions depending on the context, but にかかわらず is excellent to know because it appears often in real-world written Japanese.

Yes, it can be written as 関わらず, but in this grammar pattern it is very often written in hiragana as かかわらず.

So both may appear, but learners will commonly see:

• 〜にかかわらず

Writing it in hiragana can make it easier to recognize it as a grammar pattern rather than thinking too much about the original verb.

For study purposes, it is a good idea to memorize the grammar as:

• 〜にかかわらず = regardless of ~

The structure is:

• [condition that does not matter] + にかかわらず、[main action]

In this sentence:

• 契約期間が長いか短いか = whether the contract period is long or short
• にかかわらず = regardless of
• 解約金を確認する = check the cancellation fee

So the whole flow is:

• Regardless of whether the contract period is long or short, check the cancellation fee.

This is a very useful grammar pattern because it lets you say that the same action applies in all cases.