Iluvbertie
Imperial Majesty
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IMO the personal honor that appears to have some "criteria" in terms of length of service it is the Royal Victorian Order.
These ladies who married into the BRF received their orders after many years of service to QEII, unlike the their RFOs which for two of them came within months of their weddings.
Katherine (Kent)- RFO- 1960, RVO- 1977
Brigitte- RFO-1973, RVO-1989
Sophie-RFO-2004, RVO-2012
Camilla-RFO-2007, RVO-2013.
Princess Alexandra received her RFO in 1952 and her RVO in 1960.
Princess Anne received her RFO in 1969 and her RVO in 1977. She is the current Dame Commander of the RVO.
The late Diana, Princess of Wales never received the RVO.
(Interestingly enough the DoE just received his RVO in 2017!)
The RVO is given to 'minor royals' as a general rule. The reason why the DoE received it in 2017 is that it was the only order he didn't have and there was nothing else for the Queen to give him.
Note that neither Charles nor William have it but every other working royal male does along with many of the women.