My partners longines flagship gains a minute every week to week and a half. Could leaving It be next to a radio alarm and mobile phone at night affect It? It has a eta 2892/a2 movement. It is only 2 months old. Is this acceptable?

 

+6 seconds a day
Spot on. If you want any better buy a quartz

http://en.wikipedia.org/wiki/COSC

 

Not interested in quartz, was just checking this was acceptable. Thanks!