Well, I just crunched some numbers to get rough estimate, but if you want to gear up best char to find Tyrael's, why not using best estimation about lvl 99 char? 
1-90 is doable in couple hours.
90 - 98 = 2025 Baalruns. Assuming lite sorceress can do 2:30 runs, what is easily doable, and can go much faster then that - that is 84.375h.
For 98-99 you switch to 200 fcr litesorc running p1 seals/p7 diablo (53k XP according to my javazon, and you need total 5100 runs with saved NM ancient quest) That's about 60 second per run at most. That's another 85 hours. 170 total. 170 x 3 = 510, and you still can get at least lvl 97 char with remaining time
Yeah, finding Tyrael's is possible with some extreme dedication, but it varies hugely up and down on scale. I wouldn't really count it ever, even when statistics are on your side. With lvl 99 you are sure to get it cause you see that XP bar moving. With Tyrael's there is no guarantee, and effort is much higher. I'm not sure if people are brave enough to go hunting for it knowing it might never happen. You will probably end up in tears with PTSD, vomiting rainbows after thousandish hours without it dropping.
I do think that ~930h would net you RW grail if you run travincal, and if not, you would have good chunk of it to show off. With Tyrael's, you either win or loose. If you win, it's to be expected considering effort, but if you loose, you loose big time.

1-90 is doable in couple hours.
90 - 98 = 2025 Baalruns. Assuming lite sorceress can do 2:30 runs, what is easily doable, and can go much faster then that - that is 84.375h.
For 98-99 you switch to 200 fcr litesorc running p1 seals/p7 diablo (53k XP according to my javazon, and you need total 5100 runs with saved NM ancient quest) That's about 60 second per run at most. That's another 85 hours. 170 total. 170 x 3 = 510, and you still can get at least lvl 97 char with remaining time

Yeah, finding Tyrael's is possible with some extreme dedication, but it varies hugely up and down on scale. I wouldn't really count it ever, even when statistics are on your side. With lvl 99 you are sure to get it cause you see that XP bar moving. With Tyrael's there is no guarantee, and effort is much higher. I'm not sure if people are brave enough to go hunting for it knowing it might never happen. You will probably end up in tears with PTSD, vomiting rainbows after thousandish hours without it dropping.
I do think that ~930h would net you RW grail if you run travincal, and if not, you would have good chunk of it to show off. With Tyrael's, you either win or loose. If you win, it's to be expected considering effort, but if you loose, you loose big time.
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