Call it 40-50 years from present if you can't get your head around unlimited. And if you can provide some basis for your number, all the better...
I thought I had some notes on a 'forever' portfolio, but couldn't find them. But that's OK, I did dome fresh FIRECALC runs and probably looked at it in a different light anyhow. Some things are quite interesting (IMO):
First important lesson - Forget about long-term. Thirty, forty, fifty years isn't the problem, things average out by then (historically) - the first 2-20 years is what can put the fear into you.
So the approach I took was to first run FIRECALC for 30 and 40 years with 3.0% and 2.5%. I was looking to see the portfolio maintain its value in the worst case over this time (that should be an indication it could last 'forever'). I always start with $1M so the 'spend' becomes the WR with just a decimal shift. Some numbers:
WR | Years | Lowest Remaing Portfolio |
3.0% | 30 | $568K |
3.0% | 40 | $546K |
| | |
2.5% | 30 | $953K |
2.5% | 40 | $1M |
So I ruled out 3.0% WR, but 2.5% essentially maintains your original buying power for the 30 and 40 year periods, even in the worst case. Now it gets interesting. I ran the 2.5% for 20 years and the result was a bit of surprise:
WR | Years | Lowest Remaing Portfolio |
2.5% | 20 | $564K |
so I ran a bunch more:
WR | Years | Lowest Remaing Portfolio |
2.5% | 25 | $701K |
2.5% | 20 | $564K |
2.5% | 15 | $459K |
2.5% | 10 | $494K |
2.5% | 7 | $556K |
2.5% | 5 | $498K |
2.5% | 4 | $551K |
2.5% | 3 | $559K |
2.5% | 2 | $589K |
2.5% | 1 | $704K |
So, can you 'tough out' losing half the portfolio in the first 5 years when you want it to last 40-50 years? Not so easy.
Go ahead and run some more with 2%, with different AAs, but I think you'll find it is tough to get a balance of a low stock % to reduce those dips, and also survive for the 30-40 year periods.
Ahh, I did find this note from a thread I started 3 years ago:
http://www.early-retirement.org/forums/f28/firecalc-dips-in-net-worth-anyone-scared-32866-2.html
A few runs and it seemed to show that if you want some assurance that the buying power of your net worth does not drop by more than half, you are looking at ~ a 2% SWR. At that point, time frame doesn't seem to matter much.
It depends on when you ask.
After a long bull market, 5-9% seems reasonable.
After a severe recession, 1-2.5% seems reasonable.
This is even if you keep the people you ask the same.
Recency bias.
2Cor521
While those numbers may be the "seem reasonable" responses you would get from many, they are exactly the opposite from what they should be. After a long bull, your portfolio is 'pumped up' and ready for a fall - you need to take a low WR at that point. And you can take a higher one after a severe recession.
-ERD50