Sure, if you use a fairly loose definition of "most".

The N800 was released on January 8th, 2007 at $399 in the US.

Assuming we define life to be the period from then until the start of this topic on February 24th, 2008*, then the N800 lasted for about 415 days.

The initial price drops from $399 into the $350 range occurring around April, assuming exclude this price drop from the calculations, the next major price drop was at the end of August to the $250 range.

The first major drop occurred approximately 260 days from release.

260/415 = ~63%

Thus, N800 was at or near its release-day price point for only about 60% of its total lifetime.

For comparison, the 770 was released on November 14th, 2005 in the US, and the first big price drops occurred around June 2006. Around 230 days.

Applying this historical data to the N810, it seems likely that N810's big price-drops should occur sometime around July. In my opinion, historical data doesn't have a particularly large amount of meaning in this context, though. Especially considering the impending introduction of the WiMAX tablet and the not-really-an-update nature of the N810 release.†

*This date is based on the starting date of this thread, and really has no basis in reality. I only used what I had to work with.

†We're still due for a real generational upgrade, which the WiMAX tablet seems unlikely to provide (judging by the timing and the RX-48 product code).