--- a/pkg/controllers/importqueue.go	Thu Mar 26 14:41:23 2020 +0100
+++ b/pkg/controllers/importqueue.go	Thu Mar 26 22:24:45 2020 +0100
@@ -23,6 +23,7 @@
 	"net/http"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/gorilla/mux"
@@ -598,21 +599,46 @@
 
 	results := make([]reviewResult, len(rs))
 
-	for i := range rs {
-		rev := &rs[i]
-		msg, err := decideImport(req, rev.ID, string(rev.State))
-		var errString string
-		if err != nil {
-			errString = err.Error()
-		}
-		results[i] = reviewResult{
-			ID:      rev.ID,
-			Message: msg,
-			Error:   errString,
-		}
+	for i := range results {
+		results[i].ID = rs[i].ID
+		results[i].Message = fmt.Sprintf("Finalizing import #%d in progress.", rs[i].ID)
 	}
 
-	return mw.JSONResult{Result: results}, nil
+	var wg sync.WaitGroup
+	var mu sync.Mutex
+
+	for i := range rs {
+		wg.Add(1)
+		go func(idx int) {
+			defer wg.Done()
+			rev := &rs[idx]
+			msg, err := decideImport(req, rev.ID, string(rev.State))
+			mu.Lock()
+			if err != nil {
+				results[idx].Error = err.Error()
+			}
+			results[idx].Message = msg
+			mu.Unlock()
+		}(i)
+	}
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		wg.Wait()
+	}()
+
+	select {
+	case <-time.After(20 * time.Second):
+	case <-done:
+	}
+
+	out := make([]reviewResult, len(rs))
+	mu.Lock()
+	copy(out, results)
+	mu.Unlock()
+
+	return mw.JSONResult{Result: out}, nil
 }
 
 func reviewImport(req *http.Request) (jr mw.JSONResult, err error) {
@@ -641,23 +667,16 @@
 	id int64,
 	state string,
 ) (message string, err error) {
-	ctx := req.Context()
-
-	accepted := state == "accepted"
 
 	session, _ := auth.GetSession(req)
 	reviewer := session.User
 
+	ctx := req.Context()
+	accepted := state == "accepted"
+
 	if err = imports.DecideImport(ctx, id, accepted, reviewer); err != nil {
-		err = mw.JSONError{
-			Code:    http.StatusBadRequest,
-			Message: err.Error(),
-		}
-		return
+		return "", err
 	}
 
-	message = fmt.Sprintf(
-		"Requested import #%d to be %s.", id, state)
-
-	return
+	return fmt.Sprintf("Import #%d is %s.", id, state), nil
 }