Because after the quantity word tolik, Czech uses the genitive form of the noun.
Here:
So:
Since čas is treated like an uncountable noun here, it appears in the genitive singular: času.
In this sentence, the main reason is tolik, not the negation.
Modern Czech normally says:
So the object does not usually switch to genitive just because of ne-.
But with quantity expressions like tolik, the noun regularly goes into the genitive:
So in Nemám tolik času, the genitive is triggered by tolik.
Tolik expresses an amount: so much, that much, or this much, depending on context.
In this sentence, it usually means something like:
It often suggests a comparison, expectation, or limit:
They are similar, but not identical.
Nemám čas. = I don’t have time.
Nemám tolik času. = I don’t have that much time.
For example:
Yes. Czech word order is flexible, and changing it usually changes emphasis, not the core meaning.
Emphasizing the amount:
That second version can sound like:
So the original sentence is the most neutral and standard order.
Because Czech has no articles.
English says:
Czech simply uses the noun without an article:
Whether the meaning is definite or indefinite is understood from context.
Roughly:
NE-mám TO-lik CHA-su
A few helpful points:
So:
It is a quantity word meaning an amount such as so much or that much.
For learners, the most important thing to remember is this:
After tolik, Czech normally uses the genitive form of the following noun.
Examples:
So even if you do not fully classify the word grammatically yet, it is very useful to remember the pattern tolik + genitive.