If it was oil based paint that you went over with latex, you will need to sand it down and remove the latex paint and re-paint it. 

When they vacate you'll need to wash all the walls and ceilings, possibly re-paint, and clean all the ductwork because of their habit. 

May be the lower end neighborhood where these rentals are located.  70% of my tenants leave trash behind. 30% leave the place spotless (one repainted the entire property at their own cost, were paint contractors).  

We purchased the house in end of February and took about 2 months to repaint/fix a few items/decorate/and get furniture delivered. 

We keep a detailed list of what is done on what day and how long it takes.I'll paste in a portion of a move out accounting, you can see that we don't indicate who did the work, us or a third party:Itemized Repairs and Related Losses to get unit back to move in condition:$622.00 Replace carpet and pad (see comments) $24.00 Kilz primer to paint flooring to block pet odor from new carpet $10.00 Purchase and install missing end cap in fridge$300.00 Repaint unit: walls heavily stained $20.00 Replace door jamb in bedroom (materials) $6.00 Replace toilet seat (materials) $80.00 Labor to complete listed repairs and remove carpet Total Repair Cost: $1,062.00Necessary Cleaning to get unit back to move in condition, all at a rate of $18.00/hour: 3 hours to clean kitchen: empty fridge, clean fridge and stove, remove canned goods left, scrub counters and flooring2 hours to clean windows: remove dirt from sills, wash blinds1.2 hours to clean bathroom: scrub floor, remove hair from shower walls, clean sink and toilet4 hours to scrub living room and bedrooms: mop floor, clean walls, deodorize bedrooms, clean baseboards (very grimy)-4 hours for normal wear & tear/acceptable landlord cleaning for one year occupancyTotal Cleaning Cost: $117.00

Sometimes it can be according to market, sometimes according to tenants and sometimes according to personal taste (styling to market, broken stuff, re-paints, re-floors, etc)Maintenance is usually less variable (lawn care, cleaning, etc)Cap-ex can be a bit of a variable, though is actually more predictable.

Repainted.

-------In 2013, my wife and I purchased a 1974 2-story "fixer" in Clovis, NM via a no-money down VA loan, which we poured our blood, sweat, and tears into for 3 years: refinishing the exterior, installing hardwood floors, upgrading countertops, repainting all the walls and trim, retiling showers, blowing out walls, replacing light fixtures, etc..

About to spend $2500 for labor and materials to repaint a 1400 sqft townhouse.

Experienced landlords:Generally speaking, when you are turning a property between long term tenants, do consider re-painting as a “standard” part of the process?