I think it depends a lot on the nature of the startup. If you're doing things that don't scale, then you might have enough work for a part-time general admin/s

I think it depends a lot on the nature of the startup. If you're doing things that don't scale, then you might have enough work for a part-time general admin/support person quite early on. The idea is to find the things where there's not a lot of value in having the founder do the work and find the cheapest way to get it done. There's a few options for how to do that. You can go to a temp agency, or you can get a recent university graduate with generalist skills pretty cheaply. That's not true for all startups, nor even most, but I've seen startups where the founder was spending more than a day a week doing data entry.