However you can consider your requirement, the network time should be faster than the speed of "log transfer"+"log applying to standby". In short words, as long as you don't have log from primary which is not applied to standby, then the synchronize is ok.
Or you can use hot standby with third party HA solution, for example:
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.