From experience this is what you should be able to get if you negotiate hard and have more than one interested party at the table. If you can find only one taker and they are aware of it you will see a much lower value.
Also: for less than 10x net, if is growing steadily just hold on to it for a little while longer, but do continue to talk to interested parties, you will meet your goal sooner or later. Patience is the big secret to successful negotiation.