Mahabharata - 3-49
ahorātraṃ mahārāja tulyaṃ saṃvatsareṇa hi
22 tathaiva veda vacanaṃ śrūyate nityadā vibho
saṃvatsaro mahārāja pūrṇo bhavati kṛcchrataḥ
23 yadi vedāḥ pramāṇaṃ te divasād ūrdhvam acyuta
trayodaśa samāḥ kālo jñāyatāṃ pariniṣṭhitaḥ )
"raamo raajyam upaasitvaa " - Rama rajyam for 11,000 years.
What does this mean?
" dasha varSa sahasraaNi dasha varSa shataani ca |
raamo raajyam upaasitvaa brahma lokam prayaasyati || " (1-1-97)
97. dasha+varSa+sahasraaNi= ten, years, thousand; dasa+varsha+sataani+ca= ten, years, hundred, also; raamaH= Rama; raajyam+upaasitvaa= kingdom, on reverencing; brahma+ lokam+gamishhyati= Brahma's abode, voyages.
"On reverencing the kingdom for ten thousand years plus another one thousand years, [i.e. for a total of eleven thousand years,] Rama voyages to the abode of Brahma... [1-1-97]
Comment: In rama raajyam upaasitvaa... the word used is upaasana is not ruling by sceptre but 'reverentially idolised the kingdom...' as one would regard or treat his personal god with reverence. Rama thus reverenced his kingdom as a devotee of his subjects and this is the concept of raama raajya.
The commentary above puts the entire issue in a different perspective!!
Raama established Raama rajyam for 10,000 + 1000 years after which He left for His Abode.
It is said at many places in the texts that Raama's story will live as long as Himalayas and the Ganga will live. Rama rajyam or Rama's memory will be there till Ganga flows. Perhaps Ganga will flow for 11,000 years after Rama's birth!! Today scientists accept that Ganga will vanish one day. We find reference to this in other olden texts too.