Medication	Onset of action (minutes)	Duration of action (hours)	Max volume of injection*
0.25% Bupivacaine (Marcaine)	30	8	60 mL
0.5% Bupivacaine	30	8	30 mL
1% lidocaine (Xylocaine)	1 to 2	1	20 mL
2% lidocaine	1 to 2	1	10 mL