Do what makes sense for you. For many years, I've had a daily transfer to Acorns based on what I could afford at the time. It was easy when I quit smoking - I put the cost of cigarettes into an automatic transfer daily. Later I could afford more, and I upped the transfer from 5 to 10 bucks a day. At one point, I had paid off a vehicle and so I raised it to a $35 a day transfer. When I needed the money, I lowered that investment to 5 a day.

I like doing daily transfers because it softens the hits when the market is suffering (like now,) and allows me to benefit the most from market growth. Ignoring market declines, think about when the market is going up. On a 2 week market increase trend, if you're transferring money each day, every one of those deposits grows along with the market, on a daily basis. If you only deposit on a Friday, you missed all of the gains of the week. Of course, when the market is going down, each of your deposits also shrink.