1 Satya Yuga 1,728,000 human years
Treta Yuga 1,296,000
Dvapara Yuga 864,000Kali Yuga 432,000
__________
Total 4,320,000 One yuga cycle.
Ram avatar was in the last quarter of Treta yuga. Sati & Parvati's story is of Sat-yuga. So Sati's existance till the last quarter of Treta yuga is doubtful.2. Sita before going for her Swayamvar had prayed to Gauri/ Parvati, so Parvati existed much before Sita.3. Many of our Mytho show makers have shown Ram-Sita's story. I clearly remember in one of the old Myho show, May be Maa Shakti, they had shown Parvati testing Ram.4. This is from the D & D thread.Just came across this bhajan of Lord Shiva. From 2:50-3.25 the singer mentions that its Parvati who came to test Lord Rama.
[YOUTUBE]http://www.youtube.com/watch?v=Ux_kvgL570A[/YOUTUBE]All these shows Parvati tested Ram, so Sati praying for her own death, She testing Ram version doesn't make sense. May be this story was added later in other Puranas after Tulasidas wrote it.Otherwise some of our Mytho show maker would have surely shown this story. It is said that some stories which were noti n the original version, are added later on, this may be one such story.