Typical Quantities (assuming a molecular mass of ~200 g/mol – adjust accordingly):
1H and COSY – typically use approximately 5mg of sample (<1mg requires an ‘Extended’ acquisition).
HMQC - typically use 10mg of sample (<5mg requires an ‘Extended’ acquisition).
13C and HMBC – typically use 20-50mg of sample (<10mg requires an ‘Extended’ acquisition).
31P ca. one quarter the amount required for 13C.
19F ca. twice the amount required for 1H.
Note: Halving the concentration of your sample, means the experiment will need to run for 4 times longer to obtain the same signal.