What is response time validation in Rest Assured and how do you assert it?

import static org.hamcrest.Matchers.lessThan;

@Test
public void testResponseTimeUnder2Seconds() {

    given()
        .when()
        .get("https://reqres.in/api/users")
        .then()
        .statusCode(200)
        .time(lessThan(2000L)); // response must be under 2000 milliseconds
}

import java.util.concurrent.TimeUnit;

@Test
public void testResponseTimeInSeconds() {

    given()
        .when()
        .get("/api/users")
        .then()
        .time(lessThan(2L), TimeUnit.SECONDS); // under 2 seconds
}

@Test
public void testResponseTimeManually() {

    long responseTimeMs = given()
                              .when()
                              .get("/api/users")
                              .timeIn(TimeUnit.MILLISECONDS);

    System.out.println("Response time: " + responseTimeMs + "ms");

    assertTrue(responseTimeMs < 2000,
        "Response time " + responseTimeMs + "ms exceeded 2000ms threshold");
}

@Test
public void testGetUsersPerformance() {

    given()
        .header("Authorization", "Bearer " + token)
        .when()
        .get("/api/users")
        .then()
        .statusCode(200)
        .contentType(ContentType.JSON)
        .time(lessThan(1000L))         // under 1 second
        .body("data.size()", greaterThan(0));
}

// Search endpoint — can be slower
@Test
public void testSearchPerformance() {
    given().queryParam("q", "john")
           .when().get("/api/search")
           .then().time(lessThan(3000L)); // 3 seconds for complex search
}

// Simple GET — must be fast
@Test
public void testSimpleGetPerformance() {
    given().when().get("/api/users/1")
           .then().time(lessThan(500L)); // 500ms for simple lookup
}