diff --git a/tests/commands/run/test_integration.py b/tests/commands/run/test_integration.py
index 795e1b73..c38f4621 100644
--- a/tests/commands/run/test_integration.py
+++ b/tests/commands/run/test_integration.py
@@ -455,8 +455,8 @@ def test_mem_limit_kill(create_package, time_tool):
     end_time = time.time()
 
     assert e.value.code == 1
-    assert end_time - start_time < 5  # The solution runs for 20 seconds, but it immediately exceeds memory limit,
-                                      # so it should be killed.
+    assert end_time - start_time < 10  # The solution runs for 20 seconds, but it immediately exceeds memory limit,
+                                       # so it should be killed.
 
 
 @pytest.mark.parametrize("create_package", [get_undocumented_options_package_path()], indirect=True)
diff --git a/tests/packages/lim/prog/lim2.cpp b/tests/packages/lim/prog/lim2.cpp
index bc919d5e..8a8677d7 100644
--- a/tests/packages/lim/prog/lim2.cpp
+++ b/tests/packages/lim/prog/lim2.cpp
@@ -2,17 +2,27 @@
 #include <chrono>
 
 using namespace std;
-using namespace std::chrono_literals;
+using namespace std::chrono;
+
+int wait(int secs) {
+    auto start = high_resolution_clock::now();
+    int i = 0;
+    while (duration_cast<seconds>(high_resolution_clock::now() - start).count() < secs)
+        i++;
+    return i;
+}
 
 int main() {
     int a, b;
     cin >> a >> b;
 
     if (a == 2 && b == 1) {
-        this_thread::sleep_for(6s);
+        int i = wait(6);
+        a += i - i;
     }
     else {
-        this_thread::sleep_for(2s);
+        int i = wait(2);
+        a += i - i;
     }
 
     cout << a + b << endl;
diff --git a/tests/packages/vso/prog/vso4.cpp b/tests/packages/vso/prog/vso4.cpp
index d8511f87..a25076ed 100644
--- a/tests/packages/vso/prog/vso4.cpp
+++ b/tests/packages/vso/prog/vso4.cpp
@@ -8,17 +8,26 @@
 #include <bits/stdc++.h>
 
 using namespace std;
+using namespace std::chrono;
 
 int rnd() {
     return rand() % 100;
 }
 
+int wait(int secs) {
+    auto start = high_resolution_clock::now();
+    int i = 0;
+    while (duration_cast<seconds>(high_resolution_clock::now() - start).count() < secs)
+        i++;
+    return i;
+}
+
 int main() {
     int a, b;
     cin >> a >> b;
     if (a == 1 && b == 1) {
-        this_thread::sleep_for(chrono::seconds(3));
-        cout << a + b;
+        int i = wait(3);
+        cout << a + b + i - i;
     }
     else if (a == 1 && b == 2) {
         vector<int*> v;
diff --git a/tests/packages/vso/prog/vso7.cpp b/tests/packages/vso/prog/vso7.cpp
index 43addfd5..9bb6181c 100644
--- a/tests/packages/vso/prog/vso7.cpp
+++ b/tests/packages/vso/prog/vso7.cpp
@@ -8,11 +8,20 @@
 #include <bits/stdc++.h>
 
 using namespace std;
+using namespace std::chrono;
 
 int rnd() {
     return rand() % 100;
 }
 
+int wait(int secs) {
+    auto start = high_resolution_clock::now();
+    int i = 0;
+    while (duration_cast<seconds>(high_resolution_clock::now() - start).count() < secs)
+        i++;
+    return i;
+}
+
 int main() {
     int a, b;
     cin >> a >> b;
@@ -23,8 +32,8 @@ int main() {
         cout << a + b;
     }
     else if (a == 1 && b == 3) {
-        this_thread::sleep_for(chrono::seconds(3));
-        cout << a + b;
+        int i = wait(3);
+        cout << a + b + i - i;
     }
     else if (a == 1 && b == 4) {
         int c = 0;