ADVISE/FEEDBACK FROM 6 SFR TO 10 AND MORE

[Sib Bahjat]

I am looking to acquire several SFR prorties in the next few months. All of my current (6) properties are located in good neighborhoods. I have minimum issues with tenants and chasing checks. Overll it has been great. I am about to leap into 10 plus properties very soon. I would like to get some feedback from folks that own 20 plus properties. I would like to know how many total hours a good self manager is involved in coordinating handyman, placing ad/signs, handling emails/phone calls, verifying employement/references, showing properties, movin in walkthrrough, chasing checks and etc...
I am looking for feedback from owners that own in all neighborhoods (A/B&C areas). Thank you!