Sorry.

But as a programmer I would have to know a lot more about the problem before estimating how long it would take.

If imacros is failing then be sure to post it in their forum at http://forum.iopus.com/viewforum.php?f=11
Bob

PS. Bonus material at
http://blog.8thlight.com/uncle-bob/2012/04/20/Why-Is-Estimating-So-Hard.html