APEC card use in China - maximum number of days in 1 year

Good morning,

With an APEC card, provided that each stay is no more than 60 days, is there a limit on the number of days that a person with an APEC card can be in China? e.g. if I were to leave china every 55 days for 1 week and then return - is there a limit on the number of entries to China. Card is valid for 5 years.

Thanks