Library size exact definition please

[AurelieMLB]

Hello everyone,

I am new here and have a very basic question please.

When someone is saying that a good library size for an RNA seq experiment is 30 M paired-end reads (e.g.: section III.2 of the ENCODE project's RNA standards, from the ENCODE experiment guidelines page), what does he/she mean please?
1- is 30 M reads the number of forward reads + the number of reverse reads?
2- is it the number of templates sequenced (i.e.: == the number of forward reads for instance)?

Many thanks for your help

[GenoMax]

Paired end include forward + reverse reads. Each pair of reads sample the same fragment, so 15 M distinct fragments.