Measuring implies interaction with the object to be measured. To render the observation meaningful, the interaction should have negligible influence on it. Under this aspect, we will discuss two prominent ultrafast timing techniques, the attoclock timing strong field ionization, and the streaking technique for measuring (single) photoionization time delays. Keeping here the interaction effects negligible requires the period of the attoclock or streaking laser to be long compared to the relevant time scale of the active electron. Otherwise non-adiabatic effects kick in. For streaking shifts we will show how to quantify these effects with the underlying energy absorption of the electron from the streaking laser.