state           doubling in days
Guam            2.4507118742
Rhode_Island    3.9468661952
Texas           4.9776569339
New_Mexico      5.1506057772
South_Dakota    5.3592656446
Alabama         5.4241476357
Mississippi     5.715764637
Massachusetts   5.7239838454
Pennsylvania    6.102194282
Maryland        6.1541184725
Connecticut     6.3795498182
Iowa            6.6594433606
Virginia        6.6741950606
Arizona         6.780725208
Oklahoma        6.9115105295
Nebraska        6.968235808
Puerto_Rico     7.1299124744
Idaho           7.365068418
Colorado        7.4730554834
Kentucky        7.621385874
South_Carolina  7.6768325486
Illinois        8.0810284491
West_Virginia   8.4688522893
Delaware        8.6203980357
Minnesota       9.3891838643
New_Jersey      9.4582234369
Louisiana       9.7189707941
Florida         9.9301103006
North_Dakota    9.9626846247
Ohio            10.0996433776
New_York        10.1253159617
Indiana         10.3918441473
Georgia         10.680140045
North_Carolina  10.7003713891
Montana         10.754038214
Oregon          10.7670471052
Arkansas        11.1114295818
Missouri        11.1698916629
California      11.7873398677
Nevada          11.9316750026
Kansas          12.275374647
District_of_Columbia    12.3128622658
Michigan        12.4212865702
Washington      12.6254780534
Utah            12.6632956558
Tennessee       14.2933672019
Wisconsin       15.0837651291
Maine           16.4525885961
Alaska          17.5160683288
New_Hampshire   17.8821361991
Wyoming         17.9761262936
Vermont         18.4928546265
Virgin_Islands  31.393736223
Hawaii          43.0255064479

No warranties expressed or implied as to the accuracy of these doubling calculations. Just computing, log(2)/(log(X_n)-log(X_n-1))