diff --git a/src/glicid_spawner/slurm.py b/src/glicid_spawner/slurm.py
index 6a29a94..bdc1029 100644
--- a/src/glicid_spawner/slurm.py
+++ b/src/glicid_spawner/slurm.py
@@ -79,6 +79,9 @@ class SlurmPartition:
     def __iter__(self):
         return iter(self.nodes)
 
+    def __len__(self):
+        return len(self.nodes)
+
     @property
     def gpus(self) -> str:
         """List of GPUs available."""
@@ -108,6 +111,9 @@ class SlurmCluster:
     def __iter__(self):
         return iter(self.partitions)
 
+    def __len__(self):
+        return len(self.partitions)
+
     def __eq__(self, other):
         return str(self) == str(other)
 
diff --git a/tests/test_slurm.py b/tests/test_slurm.py
index 7901cc3..e93070f 100644
--- a/tests/test_slurm.py
+++ b/tests/test_slurm.py
@@ -73,6 +73,8 @@ def test_slurm_dataclasses():
     assert str(partition) == 'standard'  # = name
     assert partition.name == 'standard'
 
+    assert len(partition) == 1
+
     for _node in partition:
         assert str(_node) == 'cnode001'
 
@@ -87,6 +89,8 @@ def test_slurm_dataclasses():
     assert cluster.name == 'nautilus'
     assert cluster == 'nautilus'  # __eq__
 
+    assert len(cluster) == 1
+
     for _partition in cluster:
         assert str(_partition) == 'standard'