Private messages

I made a friend and I wrote to her but many times it says that I exceeded the PM in 24 hours. And I dont really know at what time during the day can I write.I know it is only one time per day because  I am DiY 1 but when is the cuestion If you know, please can you  help me?

Silverlea

Its 1 pm every 24 hours.  So if you send your pm at 10am your next pm will be available at the same time the following day