Depends on several factors, training time, programming, weight cuts, etc.
If you're usually on a high intensity program that is almost always ready for peaking ( conjugate ) you can do frequent meets as long as you're not cutting a ton of weight each time. A meet isn't too stressful on the body for most raw lifters.
If you're on a linear periodization type that takes a good bit to peak you're pretty limited in how many you can do.
Something like triphasic just request 13-15 weeks depending on how long of a peaking cycle you want.
Personally for me anything more than 3 is pushing it in terms of progress you can make between them. Two works really well. Spring/Fall usually. Get a solid 20 weeks between meets and you can make some serious progress.