diff --git a/internal/agent/sftp/sftp.go b/internal/agent/sftp/sftp.go
index c501c28..cb234bf 100644
--- a/internal/agent/sftp/sftp.go
+++ b/internal/agent/sftp/sftp.go
@@ -86,6 +86,8 @@ func handleConnection(ctx context.Context, errChan chan string, conn net.Conn, s
 	go ssh.DiscardRequests(reqs)
 
 	for newChannel := range chans {
+		snapshots.GarbageCollect()
+
 		if newChannel.ChannelType() != "session" {
 			newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
 			continue
diff --git a/internal/agent/snapshots/windows.go b/internal/agent/snapshots/windows.go
index 56adf92..8014224 100644
--- a/internal/agent/snapshots/windows.go
+++ b/internal/agent/snapshots/windows.go
@@ -156,7 +156,7 @@ func GarbageCollect() {
 	if knownSnapshots, err := knownSnaps.GetAll(); err == nil {
 		for _, snapshot := range knownSnapshots {
 			if knownSnap, err := knownSnaps.Get(snapshot.Id); err == nil {
-				if time.Since(knownSnap.GetTimestamp()) >= 15*time.Minute {
+				if time.Since(knownSnap.GetTimestamp()) >= 30*time.Minute {
 					knownSnap.Close()
 				}
 			}