LTO-7 is 6.4TB uncompressed. LTO-10 is 48TB.

Hopefully we'll see LTO-7 this year but probably in 2016. That puts the diff between LTO6 and LTO7 at 4 years.

Extrapolating... LTO8 in 2020 LTO9 in 2024 LTO10 in 2028

LTO-10 would have ideally come in 2020 in keeping with LTO's earlier pace of 2 years per revision which is also more in line with storage increases