well i usually only buy Bosch or branded bulbs and i have rarely had any blow... my current dipped beams; one is at least 4 years old the other is original.
main beams have not been changed... so referncin months rather than years doesn't inspire me with confidence...
rear brake bulbs however is another matter.. for a while mine ate them daily; then just stopped 
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Mods Fitted
Pipercross Filter; Full 2.5" 'Wingy' exhaust; Donny Custom Turbo outlet pipe; Custom injectors;
Uprated gearbox bearings; Helix Clutch; Quaife ATB; Upgraded clutch Hydraulics; FMIC; Ported Head; ARP headstuds; Leda coilovers; 'Brembodge' 326mm disks/DS2500 pads
Dieselpowered
Fitting Custom Hybrid Turbo (1856GTBv) & controller; Remap, swirlpot, lift pump
AMW Motorsports
Custom exhaust manifold & downpipe
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