well this is a toughie - 1 of the most fundamental things about Glastonbury is that 'you never can tell..........'

having said that - she's last but 1 on the acoustic stage on Friday so should do about an hour at least.  The stage is a pretty big marquee so whatever the weather  at least you'll not get rained on 4 the duration!

the only advise i have is - don't make the same mistake I made on my 1st time!  I was so hyped up about REM headlining that I 'saved my energy' and totally missed Hole - in hindsight this is the biggest Glastonbury regret of my life (apart from not going sooner of course)

enjoy