What is the minimum duration of weeks on anticoagulation in which you would consider performing a DCCV without the need for TEE, provided the patient is an excellent historian and otherwise reliable?

If this were a board question, I agree with the guideline-listed answers here - it's 3 weeks. The most recent 2023 ACC AHA hours Atrial Fibrillation Guidelines by Joglar et al., PMID 38033089 are consistent:

• In patients with AF duration of ≥48 hours, a 3-week duration of uninterrupted therapeutic an...

3 weeks of appropriately dosed OAC in reliable patients is adequate anticoagulation for Cardioversion without the need for TEE.

3 weeks