SMT solder reflow temperature profile
If you are a manufacturer who assembles lots of PCBs for a paying customer, it is good economics to get the solder temperature profile exactly right, to reduce the incidence of tombstoning and other soldering defects.

On the other hand, if you are a hobbyist cooking boards one at a time in a toaster oven, then achieving the perfect solder profile is a waste of time.  The best hobbyist profile is:


Heat on high until the solder melts
Shut off the oven and crack the door open until the solder freezes
One or two passives will have tombstoned due to uneven heating.  Use a soldering iron to rework them.


I realize that some hobbyists build elaborate temperature controllers, but this is because hobbyists enjoy building things, not because it is necessary for a reflow process.