Depends on the artist and the venue. E.g. Paul Heaton playing Leeds and Manchester Arenas shortly, and Bramall Lane next year, all for roughly the same ticket price
it seems if you have one device thats got multiple tabs/windows going and if youre gonna get through then you should close everything else so it doesnt flag you. Figure theres enough time to do that if you get to about 75% there and its within the first 30 mins of the sale