Fwiw, I think the logic is very different when it comes to direct work, and that phrasing it in terms of what fraction of one’s time one donates isn’t the most natural of thinking about it.
You can usually relatively straightforwardly divide your monetary resources into a part that you spend on donations and a part that you spend for personal purposes.
By contrast, you don’t usually spend some of your time at work for self-interested purposes and some for altruistic purposes. (That is in principle possible, but uncommon among effective altruists.) Instead you only have one job (which may serve your self-interested and altruistic motives to varying degrees). Therefore, I think that analogies with donations are often a stretch and sometimes misleading (depending on how they’re used).
Wouldn’t it be roughly a tenth to half as effective?
Whereas choosing the wrong cause could cost orders of magnitude.
Fwiw, I think the logic is very different when it comes to direct work, and that phrasing it in terms of what fraction of one’s time one donates isn’t the most natural of thinking about it.
Can you say why?
You can usually relatively straightforwardly divide your monetary resources into a part that you spend on donations and a part that you spend for personal purposes.
By contrast, you don’t usually spend some of your time at work for self-interested purposes and some for altruistic purposes. (That is in principle possible, but uncommon among effective altruists.) Instead you only have one job (which may serve your self-interested and altruistic motives to varying degrees). Therefore, I think that analogies with donations are often a stretch and sometimes misleading (depending on how they’re used).
Roughly one-tenth to one-half as effective as sustainably donating 100% over the course of your life, which is impractical.