For how many years GHs in cex.io and KHs in scrypt.cc will last?

[Muhammed Zakir]

Hello! In other sites the agreement last up to 1 year to 5 years. Will Ghs in cex.io and Khs in scrypt.cc last till I sell it or is there any specific time? If there is any specific time and if it is less than 5 years, I want to buy GHs from pbmining.com.
Kindly,
        Muhammed Zakhir

[cooldgamer]

They both keep mining until you sell them.  However, after the first year you'll be looking at ever decreasing satoshis, so anything beyond that really is moot.  It's like having one of those USB Block Eruptors today.

[BTC_Fundamentals]

That is correct, no point to mine with them. That is the waste of time and BTC invested.