General points
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The ideal soldering process is fast heating of all the parts to be soldered and application of sufficient solder to the joint?
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Few electronic components can survive 350C for long so the key is momentarily hot leads but only warm device, Hardware like ?RF sockets can take some more heat/time but will still degrade if cooked enough
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That all means (ideally !) a relatively big bit (most beginners are surprised by what pros use on tiny circuitry) with a lot of metal near the tip on a powerful 90W thermostatic iron.
With more experience you may manage with smaller or less powerful but many beginners fail that way and don’t realise why. ?
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Tin the iron lightly. ?That solder film is critical to heat transfer
Plant the ‘big’ iron bit firmly on the biggest (thermal mass surface) wait a second or so for challenging jobs then roll the bit to also heat the smaller mass (eg PCB) ? When experience says it’s right add solder to the larger thermal mass then check it pools to the smaller , watch how the joint forms ?and let it cool. ?Always ?add the joint solder to the parts not the iron. ?
Don’t pour solder down the hole - it will run out the bottom and create impossible to see shorts. ?Apply the right amount of solder and STOP!?
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Typical wire component to PCB joints will be complete well within 1 second done right
More challenging tasks (metal cases items to large ground planes etc) ?do take longer but 10 secs is a lot and suggests a better technique as above is needed to ?heat the biggest problem without frying the other parts?
Bruce Akhurst