This was a deciding factor for me choosing to get Thermoblock rather than a boiler. I keep it on the counter ready, so there's no unpack time.
By the time I've ground the coffee the machine is warm and ready to go, and I use a distributor rather than a tamper because it's less fuss and I don't notice a difference.
Espresso takes around 30-40 seconds including grinding, steaming milk another 70 seconds but this can be done at the same time. So maybe 90 seconds plus clean up.