@Joel Owens brings up a good point, though I would caution this can be area specific. In my local area, this isn't really an issue, but if it is in yours, perhaps you'll need to resign yourself to drawing out that timeframe to 6 months instead of 2. The OP did mention this is a SFR, so no other units, which obviously makes this consideration more important.
All that said, viewing this as a cost you should or shouldn't undertake due to how many months it takes to recoup is, IMHO, the wrong way to view this. I would look at this no differently than purchasing a property in poor condition and anticipating those 6k in repairs to bring it up to my standard, and thus working that into my budget (which hopefully you did). If things are really that bad, it should be viewed as a new roof or other necessary capital project, yes its expensive and will wipe out your cashflow for a year+, but not taking care of it will just lead to greater and more expensive problems in the future. If they're that rough on the property, there is a good chance they could be slowly doing more extensive, expensive damage as we speak.
Finally, as I mentioned before, dollars and cents are important to whether REI is a good idea for anyone, but so is headache. Removing them some point soon and rehabbing your property my not be the BEST financial choice at this time (assuming I'm wrong about the risk of further, more expensive damage), but it certainly isn't a bad one, so if it makes your investment something you can continue to hold and use to further your REI strategy, all the more reason to go for it.