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you supply customers for long run and on continues basis thats why you cannt invoice them daily or weekly as you suppose to know that how much the monthly turnover is for that particular customers.
so in my work we follow the same strategy.
that depend on the kind of the company
thank you for your invitation to answer your question
Depends on the volume of sales during the month, some months100 and some90 less
In My Work :
Invoices by One Mon100
Invoices By One week25
sorry i don"t process invoices