10 Receptacles.
115 VAC × 20 AMPS = 2300 VA
80% of 20 AMP Ckt (Gen. Purpose Recept. Ckt. NEC art. 210-21 and 210-23):
2300 VA × 0.8 = 1840 VA.
180 VA per Duplex Receptacle:
1840 VA ÷ 180 VA = 10.2222
10.222 Receptacles per circuit
That would be 10 complete Duplex Receptacles, and parts of a Duplex Receptacle - to make it 0.222 of a Duplex Receptacle
Easier to just round off to 10 Receptacles! 0.222 of a Receptacle is not useful!!!
<joke>
Scott35