20190814, 06:39  #1 
(loop (#_fork))
Feb 2006
Cambridge, England
2^{4}·3·7·19 Posts 
Absurdly good luck
Running 6000 @ B1=43e6 on L2478 (first 200digit GNFS Fibonacci candidate), I found
Code:
e.29Using B1=43000000, B2=240490660426, polynomial Dickson(12), sigma=1:1188519769 e.29Step 1 took 207383ms e.29Step 2 took 68344ms e.29:********** Factor found in step 2: 7740375762651336047538103935179757607279716887642863845587 e.29:Found prime factor of 58 digits: 7740375762651336047538103935179757607279716887642863845587 e.29:Composite cofactor 10570991579334623840482883755513365612144723900388947995490841123880251343344547740058967903530860293469387580044622280139653686309968085494163 has 143 digits Code:
e.37Using B1=43000000, B2=240490660426, polynomial Dickson(12), sigma=1:86357729 e.37Step 1 took 259895ms e.37Step 2 took 71127ms e.37:********** Factor found in step 2: 275164049093203129870538695643000804660151573527986610243 e.37:Found prime factor of 57 digits: 275164049093203129870538695643000804660151573527986610243 e.37:Composite cofactor 297362418083032286913662831831249072357969201897330861036030388310680281063393526041488384532075349989927289101563373124395980680567961071896867 has 144 digits I've informed Marin; I get the impression I've been quite implausibly lucky here I'm posting mostly to have the sigma values recorded; they are 1: sigma values from gmp7.1 and so factordb.com won't accept them. 
20190814, 07:40  #2 
Sep 2003
2·5·7·37 Posts 
The limits you're using correspond to t=50 with 8704 curves, so it is pretty implausible to find both a 57digit and a 58digit factor, yes.

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