setup() {
echo "Creating namespace..."
oc create namespace test
}
cleanup() {
local start=$SECONDS
echo "Deleting namespace..."
oc delete namespace test
echo "Namespace was deleted in $((SECONDS-start)) seconds."
}
lb_test() {
local lb_name=$1
echo "Creating service $lb_name..."
oc create -f - <<-EOF
apiVersion: v1
kind: Service
metadata:
  name: $lb_name
  namespace: test
spec:
  ports:
  - port: 80
  type: LoadBalancer
EOF
local start=$SECONDS
while [[ -z "$(oc -n test get "services/$lb_name" -o 'jsonpath={.status.loadBalancer.ingress[*].ip}')" ]]
do sleep 1
done
echo "Service load-balancer for $lb_name was provisioned in $((SECONDS-start)) seconds."
}

$ setup && for i in {1..10} ; do lb_test "test$i" & done ; wait
Creating namespace...
namespace/test created
[1] 3810082
[2] 3810083
Creating service test1...
[3] 3810084
Creating service test2...
[4] 3810086
Creating service test3...
Creating service test4...
[5] 3810088
[6] 3810091
Creating service test5...
Creating service test6...
[7] 3810092
Creating service test7...
[8] 3810095
[9] 3810097
Creating service test8...
[10] 3810098
Creating service test9...
Creating service test10...
service/test1 created
service/test3 created
service/test10 created
service/test2 created
service/test4 created
service/test7 created
service/test5 created
service/test8 created
service/test9 created
service/test6 created
Service load-balancer for test1 was provisioned in 41 seconds.
[1]   Done                    lb_test "test$i"
Service load-balancer for test3 was provisioned in 70 seconds.
Service load-balancer for test10 was provisioned in 101 seconds.
Service load-balancer for test2 was provisioned in 134 seconds.
[2]   Done                    lb_test "test$i"
[3]   Done                    lb_test "test$i"
[10]+  Done                    lb_test "test$i"
Service load-balancer for test4 was provisioned in 165 seconds.
[4]   Done                    lb_test "test$i"
Service load-balancer for test7 was provisioned in 198 seconds.
Service load-balancer for test5 was provisioned in 228 seconds.
[5]   Done                    lb_test "test$i"
[7]   Done                    lb_test "test$i"
Service load-balancer for test8 was provisioned in 259 seconds.
Unable to connect to the server: dial tcp 35.226.199.120:6443: i/o timeout
Service load-balancer for test9 was provisioned in 309 seconds.
Service load-balancer for test6 was provisioned in 323 seconds.
[6]   Done                    lb_test "test$i"
[8]-  Done                    lb_test "test$i"
[9]+  Done                    lb_test "test$i"
$ cleanup
Deleting namespace...
namespace "test" deleted
Namespace was deleted in 244 seconds.
$