A couple of days?

When you own a couple of units, the odds of there being unexpected vacancies that overlap each other are usually low, but when you acquire more and more real estate, the odds of tenants moving out around similar times increases. 

Quote from @Brittany Minocchi: I'm a bit farther north, but I've helped a couple of people with loans in that area - the properties seem to be working out well for them!  

If I own a property with a 1k mortgage per month and it stays empty (or I'm trying to evict) for a couple of months then I'll be ok.

I do have a couple of properties, which are more cash-flow-heavy.

It's a winning combination of direct access to industry experts coupled with building lasting relationships and get direct feedback on your strategies in small-group format.

If you are single or a couple on the same page about house hacking, look for uneven multis.

It makes sense to focus on just a couple of markets rather than trying to learn the ins and outs of so many at once.

Im working on a couple of pre listings. 

I also use the CRMs built in email to send out 8-10k emails spaced out through a couple of days.