If you're planning on souping it in Rodinal 1+100 (tri-x exposed at 400), my chart gives 40 minutes processing with agitation
That's how not to start your own 1 hour lab
As far as Perrier... if it's flat, it should be OK. Else you're bound to get the most bubbles on film ever (and consider registering your film with the Guinness book of records
)
Right now, stand processing sounds like a good idea: I just had my A(H1N1) flu shot and my arm hurts...