DCA is still much better than not investing at all. It is just better to lump sum invest even thought it is harder to stomach.
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I would invest 10k/week. That gives you 2.5 months. I invested 18k in november/december 2019 and plan to invest 12k this february when I get my bonus. Any more stretching it out is just pure fear of a coming recession. If you arenât comfortable losing 50% of those 100k, maybe donât go with 100% stocks.
This thread I started on Bogleheads helped me a lot: https://www.bogleheads.org/forum/viewtopic.php?t=293747
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I like how everybody is aware that lump sum is probably better yet everyone seems to favour dollar cost averaging. I am not criticising, I am not in this situation so I donât know what I would do. Funny how human psychology works.
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The biggest psychological hurdle at your stage is not to invest and wait for the big dip or crash. So by starting with little money you are in the long-term game. And you will sleep well. Donât forget, with 25 of age time is your best friend. What ever you decide you will have a smile in 20 years when you think back and reflect about those many thoughts you had today.
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Slightly off topic, but a book that helped me make sense of natural tendencies towards âirrationalityâ with respect to money and investing (such as doing DCA instead of a lump sum) was âThinking Fast and Slowâ by Daniel Kahneman (heâs a psychologist/behavioural economist who has been mentioned elsewhere on this forum⊠FI, happiness, mid-life crisis & depression - #29 by 1000000CHF ). Tons of relevant material, but the sections on risk pricing, marginal utility, and differences in responses to gains and losses were super interesting.
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Which is not entirely unjustified given the current environment, is it? 
To sell, not to sell, to buy, or not to buy? Thatâs the questionâŠ
If you google âstock market to gdp ratioâ you get interesting charts like this:
Market timing doesnât work, so the answer is obvious.
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Stock market returns arenât really related to GDP growth. Especially with a market like the US where almost half of the revenues are made abroad.
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There is no question here- this question was answered in all statistical models.
You know what the math says- buy and hold without trying to time gives the best returns. You think you can beat the statistics feel free to go ahead and try to sell. Why not?
You can also win a million dollar from a lottery, the statistics says you will not - but every month some individuals do win. Maybe this time itâs you?
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Well, it is not only a question of buy or sell, there are plenty of possibilities between (depending on âhow muchâ). Like just âholdâ (or HODL 
), in the middle.
But market valuing does (look at p/e, yields, etc.).
You can adjust your expected return based on valuations, but the expected return at high valuation is still better than cash.
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It would be cool to determine a function of CAPE (for instance) that adjusts the buying intensity. Finding the optimal function in terms of profitability over n years of CAPE historical data could be a nice problem.
what is buying intensity?
CAPE generally increased over the last 100 years. Itâs pretty useless for market timing.
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Say you have 1.0 cash unit to invest each month, 0.0 would be âdo nothingâ, 1.0, âbuy buy buyâ, 0.5 would be âinvest half of the sumâ etc.
You could de-trend it.
I think the only good way of using CAPE might be for the SWR once retired, for example 1/CAPE = withdrawal rate.