glmfit:

Size nsub=10  nsub=11   nsub=12
2^20 18.362   18.513    20.429 	
2^21 23.730   24.463    22.474 	
2^22 25.494   26.162    27.471 	
2^23 29.375   28.461    28.450 	
2^24 39.404   39.002    39.487 	
2^25 60.452   58.152    59.035 	
2^26 109.609  103.685   108.452 
2^27 201.882  204.450   192.075 
2^28 434.615  399.709   396.032 
2^29          795.645 
2^30          1538.438


Creation:

Size nsub=10  nsub=10  nsub=12
2^20 15.384   15.518   13.836 
2^21 21.447   21.364   14.455 
2^22 31.399   31.359   17.374 
2^23 53.463   53.421   24.422 
2^24 93.907   98.523   36.561 
2^25 187.461  178.767  70.642 
2^26 352.554  349.744  124.192
2^27 685.747  686.239  235.133
2^28 1354.750 1360.969 464.937