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Don't update from within a Desktop Environment
Emerging time: see man genlop (app-portage/genlop)
// How long it took to emerge llvm in the past:
# genlop -t llvm
Fri Feb 27 23:19:32 2015 >>> sys-devel/llvm-3.5.0
merge time: 10 minutes and 52 seconds.
Thu Jun 18 15:25:19 2015 >>> sys-devel/llvm-3.5.0
merge time: 31 minutes and 1 second.
Wed Dec 30 11:31:05 2015 >>> sys-devel/llvm-3.5.0
merge time: 1 hour, 7 minutes and 20 seconds.
Sat Jan 2 22:15:38 2016 >>> sys-devel/llvm-3.5.0
merge time: 1 hour, 4 minutes and 19 seconds.
Thu Sep 22 02:00:32 2016 >>> sys-devel/llvm-3.7.1-r3
merge time: 1 hour, 58 minutes and 55 seconds.
Sun Oct 16 11:36:02 2016 >>> sys-devel/llvm-3.7.1-r3
merge time: 1 hour, 53 minutes and 34 seconds.
// How long the current emerge will take:
# genlop -tc
Currently merging 106 out of 126
current merge time: 28 minutes and 58 seconds.
ETA: 38 minutes and 42 seconds.
See also the compile time estimator:
!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:
--backtrack=10 or with an ever higher number.
Specifies an integer number of times to backtrack if dependency calculation fails due to a conflict or an unsatisfied dependency (default: ´3´).