Importing products with multiple categories limit in field?

[Saarinen]

I have a question about importing products with CSV Import.

Does the Categories (x,y,z...) field have a limited length?

I use only sub category id's for this field like this:
5030,5031,5032,5034,5035,5036,5037

And it works, but if I have a long list like this:
10307,10308,10309,10310,10311,10312,10313,10314,10315,10316,10317,10319,10320,10321,10322,10323,10324,10371,10372,10373,10374,10375,10376,10377,10378,10379,10380,10381,10382,10383,10384,10385,10386,10387,10388,10389,10390,10391,10392,10393,10394,10395,10396,10397,10398,10399,10492,10493,10494,10523,10524,10525,10526,10527,10528,10529,10590,10591,10592,10593,10594,10595,10597,10598,10599,10600,10601,10602,10603,10604,10605,10606,10607,10608,10609,10610,10611,10612,10613,10614,10615,10616,10616,10617,10618,10619,10620,10621,10622,10622,10623,10624,10625,10626,10627,10628,10629,10630,10631,10632,10633,10634,10635,10636,10637,10638,10639,10640,10641,10642,10661,10834,10837,10838,10840,10841,10842,10844,10845,10878,10879,10880,10881,10882,10883,10884,10885,10886,10936,10937,10938,10939,10940,10941,10942,10943,10944,10945,10946,10947,10948,10949,10950,10951,10952,10953,10978,10979,10980,10981,10982,10983,10984,10985,10986,11044,11173,11177,11180,11182,11187,11188,11189,11190,11191,11192,11215,11216,11217,11218,1121

It doesn't work. Is it somehow limited in length and how can I expand the limit? Thanks!

[Saarinen]

Any help?

Edited December 8, 2013 by Saarinen (see edit history)