How quickly should oil pressure come up?

Thanks for all the responses. I'll try to answer any questions raised in order. I'm using a mechanical gage so no sensor to change. The more I think about it, it was acting the same last year with 10w30 as it is now with 10w40. The oil and filter were changed in March and it's been driven about 1200 miles. It never gets started without being driven a minimum of 20 minutes so I would think the oil should last a long time although I change it yearly anyway. Not sure it matters, but it is not bone stock. I'm just fairly certain the bearings/oil pump have never been touched. I am running a cheap Summit cam and lifters so I've always used a higher-zinc oil to try to be safe. I'm really starting to wonder about the drain-back valve as the Wix filters I've been using were purchased on Amazon. Maybe old stock or "seconds"? I'll be sorry I ask this but what brand of filter are you guys using?