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Depends largely on how moldy you let it get (i.e. how often you clean it) - here are a couple of previous questions about moldy seals with answers FYI - generally it should go 10 years or so before the rubber gets old and porous and build moldy slime quickly - though I have seen LG and Samsung's where they go slimy in weeks because of the very soft porous urethane (?) rubber they are made of.
...... Another factor of course - if it is replaceable yourself or not. Some just press/snap into place, some have simple tab inserts or a few screws holding them in, some have to be glued in with special glue, at least one Samsung and one Kenmore/Whirlpool I have seen you have to half disassemble the front of the washer and take the drum out to replace it....... Or unless you have a bad back just throw away the front loader and go with a top-loader for what seems like typically twice or triple the interval between repairs and much lower repair cost when it is needed - and at a small fraction of the cost if you avoid the unnecesasary electronics and go with a simple mechanical timer one for about $400-500.
Answered 8 days ago