A method performed by a communication device for determining an extended time period related to a Non Access Stratum, NAS, signalling message (221, 222) between a core network node and the communication device in a wireless communications network, the method comprising: obtaining (201a, 301) an indication of a coverage capability of the communication device, wherein the indication of the coverage capability is an indication that the communication device operates according to a coverage extension of a Radio Access Technology, RAT; obtaining (202a, 302) an indication of a time period, which time period is related to the signalling message and may be used for communication devices that do not operate according to coverage extension; and determining (203a, 303) the extended time period related to the signalling message (221, 222), based on the indication of the coverage capability of the communication device and based on the indication of the time period, wherein determining (203a, 303) the extended time period comprises: determining a multiplicative factor for multiplying the time period, based on the obtained indication of the coverage capability of the communication device; and determining the extended time period based on the multiplicative factor and the obtained indication of the time period, and wherein a timer based on the extended time period is started when the signalling message (221, 222) is transmitted, and the timer is stopped in response to a received response to the signalling message (221, 222), and wherein the multiplicative Z factor is further based on an amount of data or a number of signals comprising the signalling message (221, 222), that needs to be transmitted between the communication device and the core network node in both uplink and downlink in a time interval defined by a start and a stop of the timer. obtaining (201a, 301) an indication of a coverage capability of the communication device, wherein the indication of the coverage capability is an indication that the communication device operates according to a coverage extension of a Radio Access Technology, RAT; obtaining (202a, 302) an indication of a time period, which time period is related to the signalling message and may be used for communication devices that do not operate according to coverage extension; and determining (203a, 303) the extended time period related to the signalling message (221, 222), based on the indication of the coverage capability of the communication device and based on the indication of the time period, wherein determining (203a, 303) the extended time period comprises: determining a multiplicative factor for multiplying the time period, based on the obtained indication of the coverage capability of the communication device; and determining the extended time period based on the multiplicative factor and the obtained indication of the time period, and determining a multiplicative factor for multiplying the time period, based on the obtained indication of the coverage capability of the communication device; and determining the extended time period based on the multiplicative factor and the obtained indication of the time period, and wherein a timer based on the extended time period is started when the signalling message (221, 222) is transmitted, and the timer is stopped in response to a received response to the signalling message (221, 222), and wherein the multiplicative Z factor is further based on an amount of data or a number of signals comprising the signalling message (221, 222), that needs to be transmitted between the communication device and the core network node in both uplink and downlink in a time interval defined by a start and a stop of the timer.