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Much longer? No, unless you're comparing to using fast charge with a 30W charger and USB-C to Lightning cable. Somewhat longer? Yes. 7.5W is common for induction chargers. Apple's iPhone chargers in the box have long been 5W; I don't know what the wattage will be on this year's iPhone chargers.

You lose some speed, you gain some convenience.

It's also unfortunately less efficient, consuming more power not using a cable to charge.

It’s getting better I guess. I’ll let you know in a couple years when I’m ready to ditch my iPhone 7.

https://wccftech.com/the-iphone-xs-and-iphone-xs-max-both-ha...

There is no reason why it should take any longer. Induction chargers can deliver much more power than a phone battery can use.