Hevetiden kommer an på romtemperaturen.

The base form is hevetid, and hevetiden is the definite singular form.

• hevetid = rising time / proofing time
• hevetiden = the rising time / the proofing time

In Norwegian, definiteness is often shown by adding an ending to the noun instead of using a separate word like the.

So:

• en hevetid = a rising time
• hevetiden = the rising time

In this sentence, Norwegian uses the definite form because it is talking about the relevant rising time for the dough in that situation.

Komme an på is a fixed expression meaning to depend on.

So:

• Hevetiden kommer an på romtemperaturen = The rising time depends on the room temperature

You should learn komme an på as a whole expression, not by translating each word separately.

Because komme an på is a multi-word verb expression. Norwegian often has verbs that work together with small words like an, opp, ut, på, and so on.

Here:

• kommer = the finite verb
• an på = particles/preposition that belong to the expression

So even though the meaning is depend on, Norwegian builds it as komme an på.

This is normal:

• Det kommer an på været. = It depends on the weather.
• Alt kommer an på hvordan du gjør det. = Everything depends on how you do it.

Because in a normal main clause, the finite verb takes its usual position, and the rest of the expression stays after it.

The full expression is still komme an på, but in a sentence it appears as:

• kommer an på

This is just how the expression behaves in real use.

You can think of it like this:

• dictionary form: å komme an på
• present tense in a sentence: kommer an på

So the sentence structure is completely normal.

Romtemperaturen is the definite singular form of romtemperatur.

• romtemperatur = room temperature
• romtemperaturen = the room temperature

Norwegian often uses the definite form in places where English might also use the, or even where English might sound a bit more general.

In this sentence, romtemperaturen refers to the room temperature in the relevant setting, so the definite form sounds natural.

Because Norwegian usually puts the definite article at the end of the noun.

So instead of:

• the room temperature

Norwegian says:

• romtemperaturen

with -en doing the job of the.

This is very common in Norwegian:

• boken = the book
• ovnen = the oven
• deigen = the dough

If there is an adjective, Norwegian often uses double definiteness:

• den varme deigen = the warm dough
• den lave romtemperaturen = the low room temperature

This follows the normal V2 word order of Norwegian main clauses: the finite verb usually comes in the second position.

Here the first element is:

• Hevetiden

So the finite verb comes next:

• kommer

Then the rest follows:

• an på romtemperaturen

So the sentence structure is:

• Hevetiden
  • kommer
    • an på romtemperaturen

If you moved another element to the front, the verb would still stay in second position:

• Ofte kommer hevetiden an på romtemperaturen.

Yes. That is also correct.

• komme an på = depend on
• avhenge av = depend on

So these are both natural:

• Hevetiden kommer an på romtemperaturen.
• Hevetiden avhenger av romtemperaturen.

A learner may find avhenger av easier because it lines up more closely with English depends on.
But kommer an på is extremely common and very useful in everyday Norwegian.

Yes. Hevetid is a compound noun.

It is made from:

• heve = to raise / to rise / to proof in baking contexts
• tid = time

So hevetid literally means something like rising time or proofing time.

Compound nouns are very common in Norwegian, especially in practical vocabulary:

• steketid = cooking time / baking time
• romtemperatur = room temperature
• baketid = baking time

Kommer is the present tense of komme.

So:

• å komme = to come
• kommer = comes / is coming

In the expression komme an på, it gives:

• kommer an på = depends on

Other common forms are:

• kom an på = depended on
• har kommet an på = has depended on

Examples:

• Det kommer an på temperaturen. = It depends on the temperature.
• Det kom an på temperaturen. = It depended on the temperature.
• Det har kommet an på temperaturen. = It has depended on the temperature.

Yes, usually. Hevetid is mainly used in baking and refers to the time when dough is left to rise.

So in this sentence, the context is very likely bread, buns, pizza dough, or something similar.

A native English speaker may also see it translated as:

• rising time
• proofing time
• leavening time

The most natural English choice depends on the exact baking context, but in Norwegian hevetid clearly points to dough rising.