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Drastically? No. I’ll aim for 3 mins, if it’s 30 seconds out either way I’m not going to worry.
If I’m doing QC in the shop I would endeavour to achieve greater consistency but that is a different thing to sitting in my pants enjoying a coffee on a Sunday morning. The Sunday morning coffee is always far more enjoyable than any QC work I have done in the week because I’ve made it to drink, not to examine.
I’ve never used the metal filter, but I reckon you’ll still want the same parameters as paper filter. Go for 18g / 250ml / 2.5-3.5mins. Enjoy.