For Linux systems, for about five years now at system boot /dev/urandom is initialized. Once it's fully initialized calls to /dev/random are silently redirected to /dev/urandom. It doesn't take long at all for / dev/urandom to spin up, either.
Forgot to add: ever since Ivy Bridge in 2012, the x86 (and x86_64) architecture has included RDRAND -- a true random number generator that reseeds about every 8k bytes generated.
On post-2012 x86/x86_64, Linux will cheerfully use RDRAND as one of many entropy sources feeding into /dev/random. It spins up fast and is rooted in a TRNG: what's not to love?
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