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A general description is here.
‘system()’ and ‘system2()’ now allow the specification of a maximum elapsed time (‘timeout’).
‘install.packages()’ for source packages now has the possibility to set a ‘timeout’ (elapsed-time limit). For serial installs this uses the ‘timeout’ argument of ‘system2()’: for parallel installs it requires the ‘timeout’ utility command from GNU ‘coreutils’.
It is now possible to set ‘timeouts’ (elapsed-time limits) for most parts of ‘R CMD check’ _via_ environment variables documented in the ‘R Internals’ manual.