Question about Longines servicing

My Longines Conquest Classic is running at +100 seconds/day. It started acting this way just three or four days ago, right as I put myself on a waitlist for a Tudor Ranger (as though it knew I was replacing it). Just a week ago it was running around +6 per day.  I don’t know how old the watch is or anything if it’s past before I got it a couple months ago. 

Im buying the Ranger through Tourneau and after looking at Longines website they are one of two places locally to get my Longines sent in for servicing so that’s what I did. 

They gave me no real time frame at Tourneau and I’m curious how long you guys would expect this to take. I bought the watch used on eBay so there’s no warranty or papers either, so I’m also curious if anyone has experience as to how much this may cost. 
Lastly there are a couple watch repair shops here but after having a less than great experience with the last one I dealt with I figured I’d rather just put this in Longines capable hands and potentially pay a little extra and wait a little more. 
So, how long you think this may take?

How much you think it may cost?

Would you have just gone to the local repair shop or gone with the brand’s repair team?

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It sounds like your watch may have become magnetized -- easy enough to undo it yourself with a $13 demagnetizer from Amazon.

My Longines Master Complications Chronograph was in for service earlier this year and took about 3 months.  You can expect about $400-450 in service costs.

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JBird7986

It sounds like your watch may have become magnetized -- easy enough to undo it yourself with a $13 demagnetizer from Amazon.

My Longines Master Complications Chronograph was in for service earlier this year and took about 3 months.  You can expect about $400-450 in service costs.

Thanks, I’ve already sent it in so that ship has sailed, fingers crossed it’s a bit cheaper as it’s just a three hander with only a date wheel but we’ll see.

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I’m lucky to have a very good watchmaker near me, so they‘re my go-to for all my watchmaking needs. If you hear good recommendations or read good reviews on a different local watchmaker, I’d give them a shot next time! It’s an ETA caliber, I’m sure there’s somebody good nearby who can service it for you.