Troco a titularidade; a troca demora três dias.

Because they have different grammatical roles:

• troco = I change / I transfer
  This is the 1st person singular of the verb trocar in the present tense.

• troca = the change / the transfer
  Here, it is a noun, not a verb.

So in:

• Troco a titularidade = I transfer the account ownership / I change the ownership
• a troca demora três dias = the transfer takes three days

This is very common in Portuguese: a word related to a verb can also exist as a noun.

Titularidade means ownership, account holder status, or the name under which something is registered, depending on context.

In Brazil, it is often used for things like:

• phone plans
• utility bills
• bank accounts
• contracts
• registrations

So trocar a titularidade usually means to transfer something into another person’s name.

It is more specific than just ownership in a general sense. It often refers to the official registered holder.

Because titularidade is a feminine noun, and here it is the direct object of the verb.

• a titularidade = the ownership / the account holder registration

In Portuguese, direct objects often keep their article:

• Troco a titularidade
• literally: I change the ownership

English often drops the article where Portuguese keeps it.

That a is also the definite article the, because troca is a feminine noun:

• a troca = the change / the transfer

So the two a's in the sentence do different jobs only in terms of what they attach to:

• a titularidade = the object of the verb
• a troca = the subject of demora

But grammatically, both are just the feminine singular article the.

Yes, but that is normal in Portuguese.

Troco already tells you the subject is I, because the verb ending -o marks 1st person singular.

So:

• (Eu) troco a titularidade

The pronoun eu is usually omitted unless you want emphasis, contrast, or clarity.

This is very different from English, where you normally must say I change...

Because the subject is singular:

• a troca = the transfer

So the verb must agree with it:

• a troca demora = the transfer takes

If the subject were plural, the verb would change:

• as trocas demoram três dias = the transfers take three days

Demorar often means to take time, to take a while, or to be delayed.

In this sentence:

• a troca demora três dias
• literally: the transfer takes three days

This is a very common structure:

• O processo demora uma semana. = The process takes a week.
• Isso demora muito. = That takes a long time.

So Portuguese often uses demorar where English uses take for time duration.

Because três dias here expresses duration, not a deadline or future point in time.

• demora três dias = it takes three days

If you said em três dias, that would more naturally suggest something like:

• in three days
• meaning after three days or within three days, depending on context

So:

• A troca demora três dias = the process lasts three days / takes three days
• A troca fica pronta em três dias = the transfer will be ready in three days

The semicolon links two closely related statements:

• Troco a titularidade
• a troca demora três dias

The second part explains or adds information about the first.

A period would also be possible:

• Troco a titularidade. A troca demora três dias.

A comma would usually be less standard here because these are two independent clauses.

So the semicolon is a stylistic punctuation choice showing a close connection.

Not usually in natural English, and not really in the usual Brazilian context either.

In Brazilian Portuguese, trocar a titularidade is a set expression that usually means:

• transfer ownership
• change the registered holder
• put it in someone else’s name

So although trocar often means to exchange or to swap, here the best interpretation is to transfer/change the registration holder.

Yes, mudar a titularidade is possible and understandable, but trocar a titularidade is very common in service, contract, and account contexts.

There can be a slight difference in feel:

• trocar a titularidade = change the holder from one person to another
• mudar a titularidade = change the ownership/holder status

In many real-life situations, they may be used similarly, but trocar often sounds especially natural when one holder is being replaced by another.

A helpful approximation is:

• tee-too-lah-ree-DAH-jee

More roughly by syllable:

• ti-tu-la-ri-da-de

A few pronunciation notes:

• the stress is on da: titulariDAde
• final de in Brazilian Portuguese often sounds like jee or djee, especially in many accents
• the r in ri is usually a light tapped sound

It sounds fairly neutral and natural, especially in administrative or customer-service contexts.

Words like titularidade are a bit more technical or official, so the sentence feels more like something you would hear in:

• a company
• a service desk
• a phone provider
• a utility company
• a banking context

It is not slangy or especially casual, but it is also not overly formal.