In my experience, most of the trouble with replicas is with screw down crowns/case tubes and movements in general. It seems most replica case tubes and crowns are not up to everyday wear of winding/setting and many movements are not in very good condition to begin with.
TC watches are fine as for case, dial, tube/crown, bracelet etc but they have Asian Eta clones and there are no replacement parts except genuine Eta if they will fit. A genuine swiss Eta can be installed in a TC watch if needed and you are set for years as long as the swiss Eta is in good condition. BK watches have a good reputation too and I believe they come with swiss Etas.
I would guess that a TC, BK and quite a few others will go 20 or 25 years with good care and proper service.
My oldest running watch is a Waltham pocket watch made in 1892 and my oldest running replica is a 'DJ' with an Eta 2846 that I got in the mid 1980s for $75 from a USA Today ad.
Something else to consider...since genuine oem brands have cut most of the parts off to non AD shops (with rules not to sell parts but only install them on the customer's watch at Highway Robbery prices), you are really in much worse shape with a genuine watch needing a crown, crystal etc after the warranty has expired than a replica with the same ailment.
Examples:
I have two genuine steel TAG Heuer F1 (WA1211, WA1411) with steel bracelets and both need new black plastic bezels. Since T/H is an infamous 'No Parts For You!' company in the USA, just one bezel would cost more than I paid for both watches together and new examples are over $100 each on eBay. It's crazy, $100+ for what should be a $20 part at full retail.
Catch 22...T/H will not sell the bezel without an 'inspection' leading to a $400 'overhaul' of a $50 watch. Insanity.
Meanwhile another guy is selling generic sapphire crystals for them for $43, MG for $22 and bracelet 'cotter pins' at 10 for $25.
The MG crystals cost $2 each, sapphire $15 each, and the pins are $3 for 10.
My advice...buy a TC and don't look back.